lec 1 and 2-sadn

8/6/2019 Lec 1 and 2-SADN

1/18


2/18

2

Major TopicsMajor Topics

Information systemsInformation systems

Phases of analysis and designPhases of analysis and design

System maintenanceSystem maintenance

CASE toolsCASE tools

Alternate methodologiesAlternate methodologies


3/18

3

Basic Course StructureBasic Course Structure

CompetenciesCompetencies

Competency #1: Eliciting RequirementsCompetency #1: Eliciting Requirements

Competency #2: Creating the Business RequirementCompetency #2: Creating the Business Requirement

DocumentDocument

Competency #3: ModelingCompetency #3: Modeling

Competency #4: ObjectCompetency #4: Object--Oriented AnalysisOriented Analysis

Competency #5: TestingCompetency #5: Testing

Competency #6: EndCompetency #6: End--User SupportUser Support

Competency #7: IT FluencyCompetency #7: IT Fluency

Competency #8: Business Process ReCompetency #8: Business Process Re--EngineeringEngineering


4/18

4

CategoriesCategories

Information systems fall into one of the following eightInformation systems fall into one of the following eightcategories:categories:

Transaction processing systems (TPS).Transaction processing systems (TPS).

Office automation systems (OAS).Office automation systems (OAS). Knowledge work systems (KWS).Knowledge work systems (KWS).

Management information systems (MIS).Management information systems (MIS).

Decision support systems (DSS).Decision support systems (DSS).

Expert systems (ES) and Artificial Intelligence (AI).Expert systems (ES) and Artificial Intelligence (AI).

Group decision support systems (GDSS) and ComputerGroup decision support systems (GDSS) and Computer--SupportedSupportedCollaborative Work Systems.Collaborative Work Systems.

Executive support systems (EES).Executive support systems (EES).


5/18

5


6/18

6


7/18

7

SystemMaintenanceSystemMaintenance

System maintenance is:System maintenance is:

Removing undetected errors, andRemoving undetected errors, and

Enhancing existing software.Enhancing existing software.Time spent on maintenance typically rangesTime spent on maintenance typically ranges

from 48from 48--60 percent of total time.60 percent of total time.


8/18

8


9/18

9

CASE ToolsCASE Tools

CASE tools are automated, microcomputerCASE tools are automated, microcomputer--basedbased

software packages for systems analysis and design.software packages for systems analysis and design.

Four reasons for using CASE tools are:Four reasons for using CASE tools are:

To increase analyst productivity.To increase analyst productivity.

Facilitate communication among analysts and users.Facilitate communication among analysts and users.

Providing continuity between life cycle phases.Providing continuity between life cycle phases.

To assess the impact of maintenance.To assess the impact of maintenance.


10/18

10

CASE Tool CategoriesCASE Tool Categories

CASE tools may be divided into severalCASE tools may be divided into severalcategoriescategories

Upper CASE (also called frontUpper CASE (also called front--end CASE) tools,end CASE) tools,used to perform analysis and design.used to perform analysis and design.

Lower CASE (also called backLower CASE (also called back--end CASE). Theseend CASE). Thesetools generate computer language source code fromtools generate computer language source code fromCASE design.CASE design.

Integrated CASE, performing both upper and lowerIntegrated CASE, performing both upper and lowerCASE functions.CASE functions.


11/18

11


12/18

12


13/18

13

Reverse EngineeringReverse Engineering

Reverse engineering is generating the CASEReverse engineering is generating the CASE

design from computer program code.design from computer program code.

Source code is examined, analyzed, andSource code is examined, analyzed, andconverted into repository entities.converted into repository entities.


14/18

14

Rapid Application DevelopmentRapid Application Development

Rapid ApplicationRapid Application

development (RAD) isdevelopment (RAD) is

an objectan object--orientedoriented

approach to systemsapproach to systemsdevelopment.development.


15/18

15


16/18

16

Extreme Programming (XP)Extreme Programming (XP)

Extreme programming takes good softwareExtreme programming takes good software

development practices and pushes them to thedevelopment practices and pushes them to the

limit.limit. It is based on:It is based on:

Values.Values.

Principles.Principles.

Core practices.Core practices.


17/18

17


18/18

18

AlternateMethodologiesAlternateMethodologies

Alternate methodologies are available forAlternate methodologies are available foranalyzing systems.analyzing systems.

These include:These include: Prototyping.Prototyping.

ETHICS.ETHICS.

Project Champions.Project Champions.

Soft Systems Methodology.Soft Systems Methodology. MultiMulti--view.view.

lec 1 and 2-sadn

Documents