system and information quality
TRANSCRIPT
Information & Information
QualityIntroduction to
Systems
DSS as an IS Information Systems (IS)
Chapter
3
Introduction to Systems
Information & Information
Quality
DSS as an IS Information Systems (IS)
Chapter
3
System?
groupa of
interacting components
with a purpose
Information & Information
Quality
DSS as an IS Information Systems (IS)
Chapter
3
Introduction to Systems
Open systems
systems that has something crosses its boundary in either
direction.
Closed systems
systems that has nothing crosses its boundary in either
direction.
Each system has a boundary - separates the components of that systems (which are inside it) from its environment.
Information & Information
Quality
DSS as an IS Information Systems (IS)
Chapter
3
Introduction to Systems
Systems always incorporate feedback : output from a systems component that becomes input to a systems component.
Systems that do not use feedback to adjust their outputs
Open-loop systems
Systems that use feedback to adjust their outputs, based on how well the result of those output matches the desired result.
Closed-loop systems
Information & Information
Quality
DSS as an IS
Chapter
3
Introduction to Systems
Information Systems (IS)
Information Systems
(IS)
is a system whose purpose is to information
In 1990’s we often associate IS with computer, however, an IS need not use computers.
store
process
communicate
Information & Information
Quality
Information Systems (IS)
Chapter
3
Introduction to Systems
DSS as an IS
uses one or more data stores (database or set of files) that provide information to support the decision.
does not update the databases that it uses as external information sources.
communicates with the decision maker.
decision maker supplies specific information defining the decision to be made within the general category of decisions with which the DSS can help - tells the DSS what data to extract.
Information & Information
Quality
Information Systems (IS)
Chapter
3
Introduction to Systems
DSS as an IS
DataRetriev
al
Modeling
DataAnalysi
s
Database
Decision maker
Data for analysis
Model input Model results
Commands
Results
Answer
Queries
CommandsExtracted Data
A General Schematic of DSS
DSS as an IS Information Systems (IS)
Chapter
3
Introduction to Systems
Information & Information
QualityDataRaw facts
InformationProcessed data
comparing one data element with another
performing calculations on data.
DSS as an IS Information Systems (IS)
Chapter
3
Introduction to Systems
Information & Information
QualityQuality degree of excellence in the context of
the intended use.Quality of Information : the value of that information for its intended purpose
Factors
RelevanceCorrectness
AccuracyPrecision
CompletenessTimeliness
Usability
AccessibilityConsistency
Conformity to expectation
Cost