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The Variable Politics of the Policy Process: Issue Area Differences and Comparative Networks
Matt GrossmannAssistant Professor of Political Science,
Michigan State University303 S. Kedzie Hall
East Lansing, MI 48823(517) [email protected]
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Abstract
The politics of policy issue areas differ in multiple ways, including the
venues where policies are enacted, the frequency and type of policy
development, the relative importance of different circumstantial factors in
policy change, the composition of participants in policymaking, and the
structure of issue networks. The differences cannot be summarized by
typologies because each issue area differs substantially from the norm on
only a few distinct characteristics. To understand these commonalities and
differences, I aggregate information from 231 books and 37 articles that
review the history of American domestic policy in 14 issue areas from 1945-
2004. The histories collectively uncover 790 notable policy enactments and
credit 1,306 actors for their role in policy development. The politics of each
issue area stand out in a few important but unrelated aspects.
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The Variable Politics of the Policy Process 1
Scholars seek to understand how the political system produces public
policy, but the answers may differ across issue areas.1 Though cognizant of
these likely differences, scholars rarely consider them systematically.
Across issue areas, does American national policymaking take place in the
same venues with the same frequency? Is the relative importance of
different political circumstances similar? Are the composition of
participants in policymaking and the structure of the networks that connect
them similar? If differences are widespread, can they be easily summarized
by a typology?
This paper reviews American federal policymaking in 14 broad
domestic issue areas since World War II: agriculture, civil rights & liberties,
criminal justice, education, energy, the environment, finance & commerce,
health, housing & development, labor & immigration, macroeconomics,
science & technology, social welfare, and transportation. Across these issue
areas, neither the causal factors in the policy process nor the composition
and structure of issue networks are universal. Each issue area is distinct
from the others on a few characteristics, but typical in most respects.
Separable types of policymaking do not follow from issue area
categorizations.
1 An online appendix at www.journals.cambridge.org/jop contains a full list
of sources used in the content analysis described in this article as well as
relevant codebook instructions. Data to reproduce all numerical results and
network diagrams will be posted at www.mattg.org on publication.
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The Variable Politics of the Policy Process 2
As a result, investigations of policymaking are likely to focus on
particular aspects of the policy process based on issue area case selection
decisions, even though they seek generalized knowledge. The relevant
circumstances and actors change with the issue territory, as do the
relationships among actors and the relevant political circumstances. Rather
than assuming universality in the policy process, relying on typologies, or
creating unique theories for each issue area, scholars should be attentive to
the few ways that each issue area differs from the others.
I address these variations using historical studies of policymaking.
First, I compare general theories of the policy process, policy typologies,
and studies of issue networks. Second, I argue that issue area differences
are best conceptualized as issue-specific exceptions to general patterns,
rather than categorical distinctions based on underlying dimensions. Third,
I explain the method, which relies on a content analysis of 231 books and 37
articles that review policy history. Fourth, I review the record of significant
policy enactments in each issue area and the explanations for policy change
found in these sources. Fifth, I analyze the networks associated with each
policy area, relying on information about the actors credited with policy
enactments by historians. Sixth, I search for underlying dimensions of issue
area differences as well as clusters of issue types. Finally, I provide
descriptions of the unique features of each issue area to guide future
scholarship.
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The Variable Politics of the Policy Process 3
Issue Area Politics and the Policy Process
Many theories of the policy process largely sidestep the question of
differences across issue areas and are meant to apply to many domains.
Punctuated-equilibrium (PE) accounts (Baumgartner and Jones 1993) argue
that significant policy change is unlikely without a large increase in
consideration of a problem. The multiple streams (MS) account emphasizes
the multiple, largely independent, streams of problem definition, politics,
and policy (Kingdon 2003). The advocacy coalition framework (ACF) focuses
on the ideas and beliefs developed by interest group and government
proponents of policy change (Sabatier and Jenkins-Smith 1993).2 Although
these theories are all applied flexibly to different issues, their applications
tend to concentrate in particular areas. Studies using PE focus more on
budgets (Jones and Baumgartner 2012), the MS account draws more from
transportation and health (Zahariadis 2007), and nearly 64% of applications
of the ACF focus on environmental or energy policy (Weible, Sabatier, and
McQueen 2009).3
2 The ACF was developed to apply to issue areas that involve scientific
disputes and high degrees of belief conflict. Its application is thus somewhat
more restricted than other theories.
3 A content analysis of applications of the ACF (Weible, Sabatier, and
McQueen 2009) found few studies of economic policy, social welfare policy,
agriculture, criminal justice, or housing. Although there is no equivalent
content analysis of the other two frameworks, I noticed few applications of
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The Variable Politics of the Policy Process 4
Issue area differences could help reconcile accounts of policymaking
from different theoretical perspectives. For example, PE accounts imply that
significant policy change is driven by episodic agendas; other incremental
policy changes are thought to be less important. In contrast, historical
approaches to policy change (Pierson 2004) argue that most significant
policymaking is developmental; it relies on a path dependent process where
early decisions constrain later decisions. Alternatively, some issue areas
may be more episodic and others more path dependent.
Some theories of the policy process explicitly analyze issue area
differences. They tend to involve issue categorization schemes that focus on
one or two dimensions of variation associated with clear types. Theodore
Lowi (1964) proposes a three-part typology: redistributive, distributive, and
regulatory. The idea is that scholars should expect to find differences in the
politics of each issue area based on the kind of policy under debate and who
has something to gain or lose from policy action. Similarly, James Q. Wilson
(1980) argues that policy issues can be divided into types based on whether
the costs and benefits of policy action in the area are concentrated or
dispersed: interest group politics where both are narrow, entrepreneurial
politics where only costs are concentrated, client politics where only
benefits are concentrated, and majoritarian politics where both are broad.
PE to civil rights, science, or transportation and few applications of MS to
education or housing.
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The Variable Politics of the Policy Process 5
These typologies have been difficult for scholars to follow, since most
policy areas have elements of multiple types.4 They have not proved
especially fruitful in understanding policy area differences, but new
typologies have nonetheless proliferated (Smith 2002). The continued
interest in typologies highlights the need to understand variation across
issue areas in the venues where policymaking takes place and the factors
responsible for policy change. I investigate this variation, focusing on
several categories of explanations for policy referenced in both issue area
histories and the general literature on public policy: media coverage, public
opinion, interest groups, international factors, state and local factors,
research, events, and path dependence.5
If differences across issue areas produce distinct politics, scholars
should also observe different kinds of networks emerging in different areas.
4 Applying Lowi’s typology might categorize criminal justice and energy as
regulatory, transportation and health as distributive, and social welfare and
housing as redistributive. Apply Wilson’s typology might categorize energy
as interest group politics, housing and labor as client politics, environment
and criminal justice as entrepreneurial politics, and macroeconomics as
majoritarian politics.
5 This article considers the factors external to government institutions that
are the focus of policy process theory, rather than negotiations within the
three branches. These external factors are cited as causes of policy change,
however, rather than contextual factors driving other determinants.
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The Variable Politics of the Policy Process 6
In the classic formulation of “issue networks,” Hugh Heclo (1978) argues
that experts form relationships based on reputations for issue-specific
knowledge. Other scholars analyze these relationships, finding a “hollow
core” with no central player arbitrating conflict in many issue domains
(Heinz et al. 1993).
Yet comparative analysis of issue networks is rare. In addition, some
scholars argue that not all policy communities are large and broad enough
to merit the label of issue networks (Marsh and Rhodes 2004). Others argue
that policymaking in some areas may instead resemble iron triangles
involving a set of client interest groups, an executive agency, and relevant
congressional committees (Berry 1989).6 To investigate variation across
networks, I examine the composition of actors involved in each issue area
and the configuration of their relationships.
Issue Area Differences as Exceptions to General Patterns
Extant research has not uncovered typologies that successfully
explain how either the politics of policymaking or the character of networks
differ across issue areas. Kevin Smith (2002, 381) advocates a move from
typologies to taxonomies, classifying items “on the basis of empirically
observable and measurable characteristics.” This paper generally takes this
6 Issue areas like agriculture, energy, housing, labor, science, and
transportation have these three institutions and are sometimes considered
candidates for networks that resemble iron triangles.
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The Variable Politics of the Policy Process 7
approach, addressing two fundamental problems of policy typologies. First,
typologies assume that differences in the politics of issue areas can be
distilled into only a few important dimensions. Second, they assume that
most issue areas will fall in a clear zone along these dimensions, enabling
scholars to place them in boxes. Both assumptions may be false. Issue areas
may have broadly similar policy processes and each issue area may stand
out in only a few important aspects. This perspective should apply to both
the institutions and circumstances that make policy change possible (the
focus of the policy process literature) and the actors responsible for policy
change and their relationships (the focus of the issue networks literature).
Whether scholars are looking at where and how often policy change occurs,
the role of circumstantial factors in driving policy development, or the
people and organizations that jointly bring it about, they should not expect
issue area differences to conform to any typology.7
Issue area differences manifest themselves in both obvious and subtle
ways. It should be no surprise that criminal justice policy change happens
more often in the courts compared to other areas; after all, a large
proportion of court proceedings confront related issues. Learning that
energy policy is less likely to be affected by public opinion than other areas,
in contrast, may elicit more surprise. These differences are unlikely to be
7 Interactions between context and political factors also help produce policy
change, but historians do not discuss interactions with enough consistency
to enable incorporation into content analysis.
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The Variable Politics of the Policy Process 8
reducible to a few categories. Categorizing criminal justice as a court-
centered issue area, for example, would miss all of the ways that it is similar
to other issue areas while highlighting only one of its features. Similarly,
categorizing energy policy as immune from public opinion would also put
too much emphasis on a single aspect of its politics.
Issue network differences are also unlikely to allow categorization into
separable types. In particular, the composition of networks (such as the
partisan or institutional affiliations of its members) may vary independently
of their structure. I find that a large issue network bridging two branches of
government determines macroeconomic policy, for example, but this may
not correspond to a category that any other issue network fits well within.
Issue area differences are thus unlikely to correspond to the characteristics
that make typologies useful. Scholars should instead specify the differences
between issue areas, even if they only amount to a series of exceptions to
the typical policy process and the common features of issue networks.
Compiling Policy Area Histories
Specifying the differences across issue areas requires comparative
studies of many different policy processes. To make that possible, I rely on
secondary sources of policy history. Policy specialists often review extensive
case evidence on the political process, attempting to explain how, when,
and why public policy changes. These authors, who I call policy historians,
identify important policy enactments in all branches of government and
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The Variable Politics of the Policy Process 9
produce in-depth narrative accounts of policy development. David Mayhew
(2005, 245-252) used policy histories to produce his list of landmark laws;
he found them more conscious of the effects of public policy and less swept
up by hype from political leaders than contemporary scholarly or
journalistic judgments.
The analysis here relies on 268 books and articles that review policy
history since 1945. I compile published accounts of federal policy change in
14 issue areas, each corresponding to a category from the Policy Agendas
Project (PAP).8 I exclude the foreign policy areas of defense, trade, and
8 The agriculture category, category 4 in the PAP, covers issues related to
farm subsidies and the food supply. The civil rights & liberties policy area,
category 2, includes issues related to discrimination, voting rights, speech,
and privacy. The criminal justice area, category 12, includes policies related
to crime, drugs, weapons, courts, and prisons. Education policy, category 6,
includes all levels and types of education. The energy issue area, category
7, includes all types of energy production. The environment issue area,
category 8, includes air and water pollution, waste management, and
conservation. The finance & commerce area, category 15, includes banking,
business regulation, and consumer protection. Health policy, category 3,
includes issues related to health insurance, the medical industry, and health
benefits. Housing & community development, category 14, includes housing
programs, the mortgage market, and aid directed toward cities. Labor &
immigration, category 5, covers employment law and wages as well as
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The Variable Politics of the Policy Process 10
foreign affairs, but cover nearly the entire spectrum of domestic policy
areas.9 For each issue area, I search multiple book catalogs and article
databases using keywords from the topic lists and subcategories available
at policyagendas.org. To find additional sources, I use bibliographies and
literature reviews. Rather than sample, I construct a population of sources
based on several exclusion criteria. To focus on broad historical reviews of
the policy process, I exclude sources that do not identify the most important
enactments, those that focus on advocating policies or explaining the
content of current policy, and those that cover fewer than ten years of
policymaking. I also exclude sources that analyze the politics of the policy
immigrant and refugee issues. The macroeconomics area, category 1,
includes all types of tax changes and budget reforms. Science & technology,
category 17, includes policies related to space, media regulation, the
computer industry, and research. Social welfare, category 13, includes anti-
poverty programs, social services, and assistance to the elderly and the
disabled. The transportation area, category 10, includes policies related to
highways, airports, railroads, and boating.
9 The PAP divides policymaking into 19 categories. Three categories cover
foreign policy and two categories do not have an associated separable
policy history literature (government operations and public lands). Foreign
policy may be subject to different dynamics than those studied here and is
typically reviewed in international relations scholarship, rather than policy
history.
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The Variable Politics of the Policy Process 11
process from a single theoretical orientation without a broad narrative
review of policy history.10 The full list of sources, categorized by issue area,
is available in the supporting materials on the journal’s website.
With the help of research assistants, I read each text and identified
significant policy enactments. I include policy enactments when any author
indicated that the change was important and attempted to explain how or
why it occurred. The relevant portions of the codebook and instructions are
available in the supporting materials. For each enactment, I code whether it
was an act of Congress, the President, an administrative agency or
department, or a court. I also categorize it by issue area based on the PAP
issue area codebook.11
10 At least 80 policy studies using the ACF (Weible, Sabatier, & McQueen
2009) and at least 35 policy studies undertaken to study PE (listed at
policyagendas.org) are excluded. This guards against a search for
confirming evidence, where scholars emphasize factors that are central to
theory. Policy historians also share biases, but their collective judgment
serves as a useful comparison to theoretically driven research. For a
comparison of the advantages of each, see Grossmann (2012).
11 For the list of policy enactments, an assistant reassessed codes for
policymaking venue and issue area and, where available, compared our
codes to those in the PAP database. The Krippendorff’s Alpha reliability
score was .903 for the venue analysis and .848 for the issue area analysis.
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The Variable Politics of the Policy Process 12
I code all policy histories for the factors that each author judged
significant in each policy enactment. To capture their explanations, I have
coders ask themselves 61 questions about each author’s explanation of each
enactment from a codebook. Based on these questions, I record
dichotomous indicators of whether each author’s explanation included each
factor for every significant change in policy that they analyze. The
supporting materials include the relevant factors included in the content
analysis classified into the categories used here. Coders of the same volume
reach agreement on more than 95% of all codes.12 In the results below, I
aggregate explanations across all authors, considering a factor relevant
when any source considered it part of the explanation for an enactment.13
Most authors rely on their own qualitative research strategies to
identify significant actors and circumstances. For example, the books that I
use quote first-hand interviews, media reports, reviews by government
12 Percent agreement is the only acceptable inter-coder reliability measure
for many different coders analyzing a single case; other measures are
undefined due to lack of variation across cases.
13 I use this minimal standard because many policy histories did not include
substantial explanatory material on some of the policy enactments that they
viewed as significant. Some authors consistently list more explanatory
factors than others. Further analysis revealed that author differences do not
substantially change the relative frequency of the explanatory factors
associated with each issue area.
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The Variable Politics of the Policy Process 13
agencies, and secondary sources. I rely on the judgments of experts in each
policy area, who have already searched the most relevant available
evidence, rather than impose one standard of evidence across all cases and
independently conduct my own analysis that is less sensitive to the context
of each policy debate. Collectively, however, policy historians likely still
have biases that are reflected in their focus.14 These biases, if similar across
scholars, also inevitably color the aggregate content analysis. The policy
histories therefore offer a useful comparison to current theoretically
focused research on the policy process, but not a definitive test of their
claims.
I also record every individual and organization that was credited by
policy historians with bringing about policy change. For each policy
enactment mentioned by each author, I catalogue all mentions of credited
actors (proponents of policy change that were seen as partially responsible
for the enactment). I then combine explanations for the same policy
enactments, aggregating the actors that were associated with policy
14 Grossmann (2012) reviews these likely biases. Historians may be less
likely to notice policymaking in administrative agencies and lower courts
compared to laws passed by Congress. No measure of differences in author
research method, scholarly discipline, or time period explain the differences
across issue areas reported here, but unexplained variation in author
judgments remains. There is variation in the emphasis authors put on each
factor that they mention, but not enough similarity in the language they use
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The Variable Politics of the Policy Process 14
enactments across all authors.15 The typical explanation credits the few
actors most responsible for each policy change. Coders of the same volume
reach agreement on more than 95% of actors mentioned as responsible for
each enactment. I also count the number of members of Congress, interest
groups, and government organizations credited with policy enactments in
each issue area and categorize the actors ideologically, based on whether
they were Democrats (or liberal organizations) or Republicans (or
conservative organizations).16
I use affiliation networks to understand the structure of relationships
in each issue area. These networks include all of the actors that were
partially credited with a policy enactment in each issue area, with
undirected ties based on actors that were jointly credited with the same
policy enactments.17 This does not necessarily indicate that the actors
actively worked together, but that they were both on the winning side of a
to incorporate it in the analysis. I also assume equality across policy
changes of very different scope by using frequencies from the population of
all significant policy enactments.
15 I use this standard because some policy histories did not include any
actors associated with some policy enactments that they viewed as
significant. Further analysis using different standards (such as majority rule
across authors) revealed similar results.
16 Actors that could not be easily categorized were put in separate
unidentified categories.
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The Variable Politics of the Policy Process 15
significant policy enactment and that a policy historian thought they each
deserved some credit. The affiliation network ties are valued as integer
counts of the number of shared policy enactments between every pair of
actors.18
To assess the extent to which differences across issue areas can be
easily summarized, I use nonmetric multidimensional scaling and k-means
cluster analysis (see Everitt et al. 2011). First, I construct a dissimilarities
matrix between all pairs of issue areas based on their differences on the
number of enactments in each venue, the percentage of enactments
associated with each causal factor, and the characteristics of each issue
network. I then place the issue areas in dimensional space and clusters. The
goal is to see whether typologies can account for issue area differences.
17 The networks are not made up of all of the participants in policy
communities. Instead, they include people credited with policy enactments
in each issue area. All of the issue areas analyzed here therefore have some
network of actors jointly credited with influencing policy. Because not all
ties in the networks convey political collaboration, however, the results are
not directly comparable to past research that analyzes networks of working
relationships or coalitions.
18 If an individual and an organization of which they were a part were both
credited, they are treated as separate actors in the network. These
instances accounted for a small minority of all connections.
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The Variable Politics of the Policy Process 16
Policy Enactments Across Issue Areas
Policy is enacted in every branch of government and issue area,
though hardly with equal frequency. Figure 1 depicts the number of
significant policy enactments in each issue area in each venue since 1945,
separating laws passed by Congress from executive orders by the president,
administrative agency rules, and court decisions. Unsurprisingly, Congress
dominates policymaking in most issue areas. Nevertheless, a few issue
areas stand out for the extent to which policy enactments occur in other
branches of government. In civil rights, criminal justice, and finance &
commerce, policymaking occurs disproportionately in the judiciary.
Enactments in the energy and science & technology domains are more
likely to come from administrative agencies.
[Insert Figure 1 Here]
Policymaking in each issue area also differs dramatically in its
frequency: health and the environment are associated with more policy
enactments. This is partially a consequence of their consistent prominence
on the government agenda. The correlation between the total policy
enactments in each issue area and the number of congressional hearings
over the entire period is .49. Transportation, however, is regularly on the
agenda without producing many policy enactments.
Issue areas also differ substantially in the extent to which their
policymaking is path dependent or episodic. Figure 2 compares the
percentage of policy enactments where policy historians referred to factors
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The Variable Politics of the Policy Process 17
related to path dependence with the percentage of enactments where they
pointed to particular events driving policy change. This does not indicate
that the historians used any language related to the theoretical concepts of
path dependence or focusing events; most did not. Instead, explanations
involving path dependence included any statement that the enactment was
an extension of an earlier policy, that an earlier choice made the enactment
more likely, or that an earlier choice eliminated a potential alternative
policy. Explanations involving events pointed to the effects of war, economic
downturn, a government financial problem, a focusing event such as a
school shooting, or a case highlighting problems in a previous policy.
[Insert Figure 2 Here]
The results show that policy enactments in agriculture, energy,
housing, and labor are most likely to be path dependent. Enactments in
energy and macroeconomics are most likely to be associated with events,
especially nuclear disasters and economic downturns. These two potential
sets of explanatory factors do not directly trade-off with one another. Some
policy changes were not associated with either category of factors. Others
were associated with both past policy choices and focusing events, such as
reauthorization of an environmental statute in response to a natural
disaster. Nevertheless, more episodic policy areas were associated with
more congressional hearings. The number of hearings in each issue area is
correlated at .46 with the difference between the percentage of enactments
that were episodic and path dependent. Analyzing the policy agenda may
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The Variable Politics of the Policy Process 18
thus track episodic issue areas while missing significant enactments in
areas with more path dependence.
Reported Circumstances Responsible for Policy Enactments
Policy histories also point to somewhat different types of
circumstances in explaining policy change in each area. Table 1 reports the
percentage of policy enactments in each issue area associated with six
categories of causal factors. These categories are not mutually exclusive or
exhaustive. They were the external circumstances mentioned by policy
historians most often and are common components of theories of the policy
process. Explanations involving media coverage point to general attention
or specific articles. In the public opinion category, I include references to
public views, issues raised in an election campaign or by constituents, or a
public protest. Explanations involving interest groups include advocacy by
non-governmental organizations, business interests, professional
associations, or unions. Those involving international factors include
references to foreign examples and international pressure or agreements.
Explanations involving state or local factors include references to state or
local actions that preceded federal action or reports from state or local
officials. For explanations involving research, I include references to data or
research findings, think tank or academic involvement, or research reports.
[Insert Table 1 Here]
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The Variable Politics of the Policy Process 19
Media coverage was most commonly associated with policymaking in
macroeconomics, the environment, social welfare and transportation.
Reports of pollution, poverty, and dilapidated infrastructure all play roles in
policy development. Public opinion was a commonly reported cause of
enactments in macroeconomics, civil rights, and labor and significantly less
common in energy, finance, and science. Public concern over economic
conditions, for instance, was regularly credited with macroeconomic policy
change. Interest group influence was quite common in most issue areas, but
was significantly more common in agriculture, transportation, the
environment, and civil rights. Historians regularly credit lobbying by
industry groups in agriculture and transportation as well as advocacy by
public interest groups for civil rights and environmental protection. Science
& technology policy registered the highest rate of international influence,
with the Soviet launch of Sputnik serving as the most prominent example.
State or local influence on policy enactments was most common in the areas
of housing and civil rights but was significantly less common in science and
agriculture. According to policy historians, factors related to research were
commonly associated with policy change in most issue areas, with the
exception of civil rights. Policy historians regularly cite new data as well as
summary reports from government agencies as factors in policy change.
The Diversity of Issue Networks
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The Variable Politics of the Policy Process 20
Policy histories also credit particular individuals and organizations
with bringing about policy change in each area. The networks that I analyze
enable a visualization of the relationships among these actors. Figure 3
depicts a sample of four issue networks. Nodes are actors credited with
enactments; links connect actors credited with the same enactments. Black
nodes are Democrats or liberal organizations; white nodes represent
Republicans or conservative organizations; others are grey. Actors in the
legislative branch are represented as circles; actors in the executive branch
are squares; diamonds represent those in the judicial branch and triangles
are non-governmental actors.
[Insert Figure 3 Here]
There is remarkable variation in the composition and structure of
networks across issue areas, though none resembles a hollow core. None of
the issue areas have a clearly bifurcated network polarized by ideology,
though there are differences in degree. There is also substantial cross-
branch interaction in most, but not all, issue areas. Table 2 reports several
characteristics of the composition of each issue area’s network. Members of
Congress dominate half of the networks and interest groups dominate two
of the networks; others have a mix of central players. Organizations like
executive agencies are central in the transportation network.
[Insert Table 2 Here]
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The Variable Politics of the Policy Process 21
Table 3 reports common characteristics of the structure of each issue
area’s network.19 Size is the number of actors. Density is the average
number of ties between all pairs of actors. In this case, the interpretation is
the average number of policy enactments for which each pair of actors in
the network shared credit. Paul Hallacher (2005) uses equivalent notions of
size and interaction to compare subgovernments and issue networks,
suggesting that issue networks have high values for each. The core-
periphery model in Table 3 compares each network to an ideal type in
which a central group of actors is closely tied to one another and
surrounded by a periphery of less connected actors. The fitness statistic
reports the extent to which the network fits this ideal type; the core density
statistic reports the density within the group of actors identified as the core
of the network (a categorical distinction). High values here would indicate
that a network is far removed from the “hollow core” that characterized
some previous networks (see Heinz et al. 1993).
[Insert Table 3 Here]
Degree Centralization measures the extent to which all ties in the
network are to a single actor. The Clustering Coefficient measures the
extent to which actors that are tied to one another are also tied to the same
19 Although there are fit statistics proposed for some of these measures
(beyond the fitness measure for the core-periphery model), they generally
require simulated data and are not usefully compared to familiar statistics
(Wasserman and Faust 1994).
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The Variable Politics of the Policy Process 22
other actors.20 Table 3 also reports two versions of the E-I (external-
internal) index to track cross-branch and cross-party ties. The index
measures the extent to which ties are disproportionately across groups
(positive) or within groups (negative). The groups for the first index are
actors in Congress and those in the executive branch; for the second, the
groups are Republicans or conservative organizations and Democrats or
liberal organizations.21
Issue networks differ in their structure across issue areas. Some
networks are large and dense like transportation, whereas others are small
and dense like agriculture. The health network is large but sparse but
science is small and sparse. The issue networks that most resemble the
core-periphery structure are civil rights and the environment. The most
centralized networks are housing (around the U.S. Conference of Mayors)
20 Higher clustering coefficients indicate that, if actors share ties to other
actors, they are more likely to be tied. To determine whether actors divide
into clustered neighborhoods throughout the network, it is useful to
compare the clustering coefficient to the overall density in each network.
21 The indexes are calculated as (number of ties between actors in the two
different groups - number of ties between actors in the same group)/(sum of
both of these types of ties). These indexes may be measures of the extent of
conflict (negative) or cooperation (positive) across groups; more conflict is
usually seen as an indicator of issue networks rather than subgovernments
(Hallacher 2005).
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The Variable Politics of the Policy Process 23
and labor (around the AFL-CIO). Clustering is most evident in the
environment and least evident in energy. The networks most polarized by
partisanship are the environment, science, and civil rights. The networks
with most ties between the legislative and executive branch are housing,
finance, and macroeconomics; civil rights and science had the least cross-
branch oriented networks.
Dimensions of Issue Area Politics
To evaluate the number of underlying dimensions of issue area
politics and to see where issue areas sit relative to one another on these
dimensions, I use nonmetric multidimensional scaling. This provides two
kinds of output: information about how well a model with each number of
dimensions fits the data and a scale score for each case on each dimension.
A typology that successfully made sense of the differences in politics across
issue areas would require differences to be summarized by a small number
of dimensions where the cases clearly separated into clusters.
Figure 4 depicts a multidimensional analysis of issue area
dissimilarities, using the characteristics of policy change reported in
Figures 1 and 2, the reported circumstances associated with policy change
from Table 1, and the characteristics of issue networks from Tables 2 and
3.22 Although the model is depicted in two dimensions, the results suggest
22 It uses a dissimilarity matrix of the Euclidian distances between pairs of
issue areas for all variables in the three tables and two figures. I also
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The Variable Politics of the Policy Process 24
no clean break in the number of dimensions. The measure of Stress_1, a fit
statistic where lower numbers indicate a better fit, is .075 for a one-
dimension solution, .037 for a two-dimension solution, .016 for a three-
dimension solution, and .003 for a four-dimension solution.
[Insert Figure 4]
I also use k-means cluster analysis to divide the issue areas into
clusters based on the same dissimilarities. The Calinski-Harabasz and Duda-
Hart procedures (see Everitt et al. 2011) for determining the appropriate
number of clusters were inconclusive, with the former producing improved
fit statistics with 3 and 13 clusters and the latter producing improved fit
statistics with 4 and 5 clusters. A two-cluster solution divides agriculture,
crime, energy, finance, and science into one cluster (the issue areas on the
right side of Figure 4). One interpretation is that these issue areas are
associated with less popular mobilization whereas the others involve
broader economic and social policy agendas. An alternative three-cluster
solution separates crime into its own cluster from this group. A four-cluster
solution has a separate cluster for agriculture and for civil rights and labor.
Beyond this number, the algorithm begins separating each issue area into a
unique cluster.
created an alternative dissimilarity matrix based on standardized versions
of all of these variables. A low-dimensional solution based on the
standardized measures does not fit the data as well and fails to produce
differentiated clusters.
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The Variable Politics of the Policy Process 25
Rather than clean categories, distinctions among issue areas are best
seen as continuous differences. The results suggest that there is no easy
way to summarize the differences across the political processes surrounding
each issue area and their associated issue networks. A two-by-two typology,
for example, would have an especially poor fit with the data. We cannot be
sure that two dimensions best account for issue area differences, that the
issue areas divide cleanly along those dimensions, or that four clusters
would be the most appropriate division.
I also analyze several reformulations of the data to ensure that the
results were not a product of methodological decisions. First, I divide the
data across time into subsets of 15-year periods and searched for an
underlying structure. Second, I categorize the issue areas into a larger
number of subtopics, each covering a smaller territory. Third, I analyze only
the policy enactments considered significant by most authors in each area
and limit the explanatory factors considered to only those with consensus
across authors. Fourth, I construct distinct sets of dissimilarities based on
network characteristics and based on the factors reportedly driving policy
change. Issue area differences did not produce clear clustering on a few
underlying dimensions in any of these analyses.
Some readers may interpret the findings as evidence that there are
large differences among the scholars studying these issue areas, rather
than the issue areas themselves, but the evidence does not point in this
direction. First, authors covering policy enactments outside of their area of
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The Variable Politics of the Policy Process 26
focus (such as health policy historians explaining the political process
behind general tax laws) reached most of the same conclusions about who
was involved and what circumstances were relevant as specialist historians.
Second, there were few consistent differences in the types of actors
credited and few differences in relevant circumstantial factors reported
based on whether the authors used interviews, quantitative data, or archival
research, whether the authors came from political science, policy, sociology,
economics, history, or other departments, or how long after the events took
place the sources were written. There were idiosyncratic differences across
authors, but they did not produce the differences across issue areas.
Making Sense of Issue Area Similarities and Differences
There are some seemingly universal features of the policy process, but
there are also important differences in each issue area’s politics. The 14
domestic policy areas analyzed here differ in their frequency of
policymaking, their common venues, the circumstantial factors enabling
policy change, the actors responsible for enactments, and the structure of
networks. On each dimension of issue area differences, most issue areas fall
in the middle rather than at the extremes.
Policy typologies are unlikely to isolate the different features of
policymaking in each issue area. Indeed, the available policy area typologies
are not predictive of the differences analyzed here. Theoretical distinctions
made by Lowi (1964) and Wilson (1980) are not helpful in distinguishing
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The Variable Politics of the Policy Process 27
among the types of politics present in each issue area. Distinctions between
iron triangles, issue networks, and policy communities are equally
unhelpful. This is a sign that the theories that produce typologies should be
subjected to more scrutiny. The project of creating minimalist models of the
policy process based on ideal types may not be helpful. The iron triangle
ideal type, for example, mixes three independently varying dimensions of
network structure: a strong core, cross-institutional links, and bipartisan
links.
Instead of assuming that issues will fall clearly into boxes, scholars
should acknowledge that issue area differences are widespread but not very
amenable to categorization. Table 4 lists descriptions of the features of each
issue area that stand out when compared to the others, including the type of
policymaking, the circumstances associated with policy enactments, and the
composition and structure of the governing network. All policy areas stand
out in some ways in comparison to the others. This comparative analysis
should enable authors of case studies to check whether their findings are
likely to apply only to a few issue areas or generalize to the policy process
as a whole.
[Insert Table 4 Here]
There are also important similarities in policymaking that are
reportedly common across issue areas, even though I rely on 14 distinct
literatures on a broad spectrum of domestic policy. First, Congress is the
most frequent maker of significant policy in nearly all issue areas and it is
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The Variable Politics of the Policy Process 28
responsible for the bulk of policymaking in most areas. Second, all policy
areas have some policy enactments where path dependent explanations are
apt and others where event-related explanations are apt. Third, interest
groups and research reportedly play a common role in policymaking in most
issue areas whereas public opinion and media coverage play less frequent
roles. Fourth, all issue areas are associated with networks of actors credited
with policy change, including members of Congress, executive branch
agencies, and interest groups. These similarities are generally consistent
with the textbook treatments of federal policymaking that focus on
institutions.
The issue area differences, however, have important implications for
the generalizability of research findings. Issue area case selection decisions
make large differences in likely findings. For example, Kingdon’s (2003)
study of the policy process is based on case studies of health and
transportation. If he had instead chosen to study education and labor, he
might have shown more influence for public opinion and international
factors. Likewise, because a great deal of scholarship using the ACF focuses
on environmental policy (Weible, Sabatier, and McQueen 2009), scholars
may be more likely to find influence by interest groups and research.
The results may also show where each of the policy process
frameworks could be productively applied. The research and coalition focus
of the ACF, for example, might be useful in studies of agriculture and
housing. The focus on episodic determinants of policy change in PE studies
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The Variable Politics of the Policy Process 29
has been useful in studies of nuclear energy and budgets (Jones and
Baumgartner 2012). This comparative research shows that energy and
macroeconomic policies more broadly are the most likely to be associated
with episodic causes of policy change. Theories of path dependent
policymaking, in contrast, may be most appropriate in agriculture,
education, and housing.
The findings also have implications for normative discussions of the
policy process. Scholars who sought to divide policymaking into categories
(e.g. Wilson 1980, Lowi 1964) associated their typologies with judgments
about the relationship between the policy process and democratic values. If
issue area politics cannot be easily predicted based on whether policies
tend to benefit majorities or minorities, general claims about where
policymaking is likely to be more or less democratic may not hold up to
scrutiny. Similarly, politics in every issue area may be labeled “interest
group politics” to some degree, even though groups are not the only
important actors in any area.
Claims about iron triangles and issue networks were also meant to
raise concerns that policymaking did not live up to America’s founding
principles. Iron triangles supposedly involved domination of policymaking
by political insiders. Heclo (1978) also viewed issue networks with concern,
arguing that they came with a “democratic deficit” because they
empowered technocratic elites. Disproportionate involvement by
administrators and scientists, however, is only one source of difficulty in
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The Variable Politics of the Policy Process 30
matching our expectations of wide participation with the reality of the
policy process. Disinterested citizens representative of the nation as a
whole do not make up any issue networks. Instead, each issue area is
associated with distinct distributions of political elites.
Despite differences across issue areas, there is potential ground for
general theories of the policy process and associated critiques of the
relationship between democracy in theory and practice. Across the issue
areas analyzed here, all issue areas involved multiple institutions, interest
groups, and diverse policymakers. They incorporated several circumstantial
factors and responded to both past policy development and current events.
There are many factors in the policy process but some are much more
frequently influential than others. Issue area differences are decipherable
and should be emphasized, but the similarities in the relative importance of
each component of policymaking across issue areas are just as important.
The American national government has both a general policy process and
some unique variants for each issue area.
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The Variable Politics of the Policy Process 31
References
Baumgartner, Frank R. and Bryan D. Jones. 1993. Agendas and Instability in
American Politics. Chicago: University of Chicago Press.
Berry, Jeffrey. M. 1989. The Interest Group Society, 5th ed. New York:
HarperCollins Publishers.
Everitt, Brian S., Sabine Landau, Morven Leese, and Daniel Stahl. 2011.
Cluster Analysis, 5th ed. Hoboken, NJ: Wiley.
Grossmann, Matt. 2012. “Interest Group Influence on US Policy Change: An
Assessment Based on Policy History.” Interest Groups & Advocacy 1
(2): 1-22.
Hallacher, Paul M. 2005. Why Polity Issue Networks Matter: The Advanced
Technology Program and the Manufacturing Extension Partnership.
Lanham, MD: Rowman & Littlefield Publishers.
Heclo, Hugh. 1978. “Issue Networks and the Executive Establishment.” In
The New American Political System, ed. Anthony King. Washington:
American Enterprise Institute.
Heinz, John P., Edward O. Laumann, Robert L. Nelson, and Robert H.
Salisbury. 1993. The Hollow Core: Private Interests in National Policy
Making. Cambridge: Harvard University Press.
Jones, Bryan D. and Frank R. Baumgartner. 2012. “From There to Here:
Punctuated Equilibrium to the General Punctuation Thesis to a Theory
of Government Information Processing.” Policy Studies Journal 40 (1):
1-19.
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The Variable Politics of the Policy Process 32
Lowi, Theodore. 1964. “American Business, Public Policy, Case-Studies, and
Political Theory.” World Politics 16 (4): 677-715.
Kingdon, John W. 2003. Agendas, Alternatives and Public Policies, 2nd Ed.
New York: Addison-Wesley.
Marsh, David and R. A. W. Rhodes. 2004. “Policy Communities and Issue
Networks: Beyond Typology,” In Social Networks: Critical Concepts in
Sociology, ed. John Scott. London: Routledge.
Mayhew, David R. 2005. Divided We Govern: Party Control, Lawmaking,
and Investigations, 1946-2002. New Haven: Yale University Press.
Pierson, Paul. 2004. Politics in Time: History, Institutions, and Social
Analysis. Princeton: Princeton University Press.
Sabatier, Paul A. and Hank C. Jenkins-Smith. 1993. Policy Change and
Learning: An Advocacy Coalition Approach. Boulder, CO: Westview
Press.
Smith, Kevin B. 2002. “Typologies, Taxonomies, and the Benefits of Policy
Classification.” Policy Studies Journal 30 (3): 379-395.
Wasserman, Stanley and Katherine Faust. 1994. Social Network Analysis:
Methods and Applications. Cambridge: Cambridge University Press.
Weible, Christopher M., Paul Sabatier, and Kelly McQueen. 2009. “Themes
and Variations: Taking Stock of the Advocacy Coalition Framework.”
Policy Studies Journal 37(1): 121-40.
Wilson, James Q. 1980. “The Politics of Regulation.” In The Politics of
Regulation, ed. James Q. Wilson. New York: Basic Books, 357-94.
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The Variable Politics of the Policy Process 33
Zahariadis, Nikolaos. 2007. “The Multiple Streams Framework: Structure,
Limitations, Prospects.” In Theories of the Policy Process, ed. Paul
Sabatier. Boulder, CO: Westview Press.
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The Variable Politics of the Policy Process 34
Table 1: Reported Circumstances Associated with Policy Enactments in Issue Area Histories
Media Coverage
Public Opinion
Interest Groups
International
State or Local Research
Agriculture 18.42% 21.05% 63.16% 13.16% 0% 47.37%Civil Rights & Liberties 21.31% 31.15% 67.21% 11.48% 24.59% 22.95%Criminal Justice 25% 30.77% 30.77% 0% 9.62% 42.31%Education 12.12% 27.27% 48.48% 12.12% 18.18% 42.42%Energy 18.18% 13.64% 36.36% 13.64% 18.18% 31.82%Environment 29.9% 25.77% 69.07% 12.37% 19.59% 54.64%Finance & Commerce 10.34% 6.9% 36.21% 3.45% 5.17% 22.41%Health 10.53% 11.58% 36.84% 7.37% 9.47% 38.95%Housing & Development 16.67% 13.89% 58.33% 0% 19.44% 44.44%Labor & Immigration 16.07% 30.36% 55.36% 10.71% 12.5% 37.5%Macroeconomics 22.92% 41.67% 54.17% 14.58% 8.33% 41.67%Science & Technology 7.89% 7.89% 36.84% 23.68% 2.63% 28.95%Social Welfare 22.22% 22.22% 38.89% 0% 13.89% 36.11%Transportation 22.22% 17.78% 57.78% 0% 6.67% 31.11%
The table reports the percentage of enactments that involved each factor, according to policy historians.
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The Variable Politics of the Policy Process 35
Table 2: Issue Area Governing Network Composition
Most Central (Degree)
Dominant Type
Congress Members
Interest Groups
Government Orgs.
# Links # Links # Links
Agriculture Ag. Dept, Farm Bureau Congress 17 9.9 8 9.9 6 6
Civil Rights & Liberties
NAACP, JFK, MLK Jr.
Int. Groups 63 20.4 52 4.9 16 23.1
Criminal Justice ACLU, Bar Assoc.Int. Groups 20 6.7 16 8.4 11 7.2
Education Edith Green, NEA Congress 54 19.5 27 16.1 15 16.1Energy Ford, Ted
Kennedy Congress 20 5.3 12 4.1 9 2.4
Environment Ed Muskie, J. Blatnik Mixed 36 13.1 34 7.2 33 13.1
Finance & Commerce Eisenhower, LBJ Congress 19 3.4 3 3 7 3.1
Health Truman, Mary Lasker Congress 46 9.7 31 9.9 26 8.7
Housing & Development
U.S. Conf. of Mayors Mixed 39 9.7 29 14.6 22 9.5
Labor & Immigration
AFL-CIO, Labor Dept. Mixed 76 14.8 63 17.4 24 16.5
Macroeconomics Wilbur Mills, Treasury Congress 42 11.6 12 15.2 16 20.4
Science & Technology FCC, Nixon Mixed 12 2.8 12 2.8 13 4.7
Social Welfare Wilbur Mills, Social Sec Congress 45 11.4 24 12.7 18 16.7
Transportation Ford, Ted Gov. Orgs. 24 16.1 29 18.6 30 20.8
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The Variable Politics of the Policy Process 36
KennedyThe table reports characteristics of the actors credited with policy enactments in each issue area.
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The Variable Politics of the Policy Process 37
Table 3: Issue Area Governing Network Structural Characteristics
Core-Periphery E-I Index
Size Density
Fitness
Core Densi
ty
DegreeCentraliza
tion
Clustering
Coefficient
Congress-Admin.
Bipartisan
Agriculture 49 0.17 0.7 0.88 9.50% 1.02 -0.11 -0.14Civil Rights & Liberties 210 0.1 0.69 1.07 7.21% 1 -0.34 -0.28Criminal Justice 83 0.08 0.52 1 10.52% 1.02 -0.5 -0.17Education 170 0.1 0.47 0.62 9.83% 0.97 -0.14 -0.23Energy 65 0.07 0.59 1 5.96% 0.91 -0.18 -0.28Environment 144 0.09 0.68 4.39 7.74% 1.2 -0.21 -0.42Finance & Commerce 54 0.06 0.48 1.05 4.34% 0.99 -0.03 -0.03Health 141 0.07 0.49 1.17 6.60% 1.01 -0.28 -0.01Housing & Development 119 0.1 0.48 0.87 15.50% 1 -0.07 -0.23Labor & Immigration 211 0.1 0.49 0.84 14.18% 1.14 -0.06 -0.19Macroeconomics 118 0.12 0.67 1.07 9.94% 1.06 -0.02 -0.01Science & Technology 70 0.06 0.29 2 4.38% 0.98 -0.38 -0.29Social Welfare 136 0.1 0.56 1.04 8.06% 1.07 -0.13 -0.24Transportation 127 0.19 0.76 1.29 13.48% 1.12 -0.13 -0.15
The table reports structural characteristics of the affiliation networks associated with policy enactments in each issue area.
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The Variable Politics of the Policy Process 38
Table 4: The Relative Features of Each Issue Area’s Politics
Type of Policymaking
Relevant Circumstances
Network Composition Network Structure
AgricultureRegular, path dependent enactments
High interest group influence
Small, mostly congressional network
Dense core-periphery network
Civil Rights & Liberties
Multi-branch, frequent, and path dependent
High state/local influence but low research influence
Large network with many interest groups
Core-periphery structure but low centralization
Criminal Justice
Disproportionately judicial enactments
High research influence but no international influence
Small network with central interest groups
Executive-congressional divide
EducationPath dependent enactments by Congress
No dominant influential factors
Large network dominated by members of Congress
Core with satellite clusters
EnergyDisproportionately administrative, event-driven
Low public opinion and high state/local influence
Small network, concentrated in Congress
Low centralization
EnvironmentMany enactments with congressional dominance
High media, state/local, and research influence
Disproportionately Democratic network
Dense core with high clustering
Finance & Commerce
Split policymaking between Congress and courts
Low research influence
Small, congressional and presidential network
Sparse decentralized network
Health Many enactments in Congress
No dominant influential factors
Large network, dominated by members of Congress
Sparse ties
Housing & Developmen
Path dependent enactments in
High state/local, low public opinion
Large diverse network
Centralized network with partisan divide
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The Variable Politics of the Policy Process 39
t Congress influenceLabor & Immigration
Multi-branch enactments
High public opinion and group influence
Large, diverse network, centralized on AFL-CIO
Sparse network, with high clustering
Macroeconomics
Event-driven, legislative enactments
High public opinion and research influence
Congress-dominated network
Dense network with high inter-branch/bipartisan ties
Science & Technology
Disproportionately administrative enactments
Low public opinion but high international influence
Diverse, with many government organizations
Sparse, disconnected network with no core
Social Welfare
Infrequent, path dependent enactments
High media but no international influence
Congress-dominated network
Large divided network
Transportation
Regular congressional enactments
High interest group, no international influence
Large diverse network, with government organizations
Dense core-periphery network; high clustering
The table reports descriptions of where each issue area stands out among the others, based on the analysis of policy area histories conducted here.
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The Variable Politics of the Policy Process 40
Figure 1: Policy Enactments by Venue and Policy Area
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The Variable Politics of the Policy Process 41
The figure depicts the number of policy enactments in each branch of government from 1945-2004, based on policy histories of each issue area.
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The Variable Politics of the Policy Process 42
Figure 2: Developmental and Episodic Reported Causes of Enactments by Policy Area
The figure depicts the percentage of policy enactments in each issue area that were reportedly affected by path dependence (including earlier policy choices that made the enactment more likely or eliminated alternatives) and focusing events (including wars and economic downturns). The reports
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The Variable Politics of the Policy Process 43
are based on policy histories in each issue area covering significant policy enactments from 1945-2004.
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The Variable Politics of the Policy Process 44
Figure 3: A Sample of Issue Networks
Nodes are actors credited with policy enactments in each area. Links connect actors credited with the same policy enactments. Democrats are black; Republicans are white; others are grey. Shape represents branch of government; circles are legislative; squares are executive; diamonds are judicial; triangles are non-governmental.
Education
Social Welfare
Transportation
Labor
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The Variable Politics of the Policy Process 45
Figure 4: Nonmetric Multidimensional Scaling of Dissimilarities Among Issue Areas
The figure is a two-dimensional plot of nonmetric multidimensional scaling results of dissimilarities based on the reported factors in policy change since 1945 and the
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The Variable Politics of the Policy Process 46
characteristics of their issue networks. The dissimilarities are based on the characteristics of issue areas reported in Figures 1-2 and Tables 1-3.