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Software System Engineering Chp4
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Transcript of Software System Engineering Chp4
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CHAPTER 4
ROLE AND UTILIZATION OF
CASE TOOLS
SOFTWARE SYSTEM ENGINEERING
(260CT)
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Motivation Definition
Characteristics
Types of CASE
Benefits
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Definition Any computer-based tool for developing
software.
Tools that diagram and documentsoftware design.
A tool which aids a software engineer to
maintain and develop software.
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THE OBJECTIVES OF CASE
Create development process standards
Improve overall application quality
Decrease design time and improve time to market
Decrease required effort and time in application testing Encourage integration of development projects
Improve effectiveness of project management activities
Decrease required effort and time in application maintenance
activities Promote organization wide reusable program code
Improve portability of application across platform andoperating environment
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Characteristics
Graphics Interface for creating Diagrams
Central Repository For storing and managing Allmetadata
Highly Integrated Toolset Sharing a common userinterface
Modules to assist every phase of the lifecycle
Prototyping Facilities
Automatic code generation from analysis/design
Definitions Support Development Lift Cycle
Extensive Error Checking
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Types of CASE
Upper Case:
Front End Tools
Planning
Design
Analysis
Lower Case:
Back End Tools
Prototyping Code Generation
Schema Generation
4GLs
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COMPONENT OF CASE TOOL
Process Modeling Tools
Detailed Analysis Tools
Transformation Tools
Database/Application Design Tools
Application Generation Tools
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Categories of CASE
Diagramming Tools
Dictionaries
Specification Validation Code and Schema Generation
Documentation Generation
Reverse Engineering
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Benefits
Makes structured methods practical to perform
Enforces engineering disciplines (Software Information)
Improves Software Quality through
Facilitating User Involvement Automated Checking
Facilitates Prototyping
Simplifies Program Maintenance
Accelerates the development process
Permits specific focus by developer and user
Encourages Evolutionary and Incremental Development
Enables Component Engineering (Re-use)
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Traditional vs CASE
Emphasis on coding andtesting
Paper prototyping
Paper Specification
Manual Coding Manual Documentation
Software Testing
Code Maintenance
Emphasis on Analysis andDesign
Rapid/IterativePrototyping
Stored/AutomatedSpecification
Automate CodeGeneration
Automated Error Checking
Automate Test CaseGeneration
Maintain DesignSpecification
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POTENTIAL CASE TOOL COST
CATEGORIES
Initial training and education cost
Evaluation cost
Costs of maintaining the model over time Upgrade costs of the tool
Ongoing usage/maintenance fees
Time lost waiting for the tool to do its job
Time lost overusing the tool
Migration costs to transport models to anothertools
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POTENTIAL CASE TOOL COST
CATEGORIES
Increased effort to synchronize models withother artifacts such as source code
Often, promotion of syntax over
communication between developers
Generated code that is often to simplistic or iscluttered with extraneous information requiredby the tool
Poor user interface that often hamper themodeling effort
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POTENTIAL CASE TOOL COST
CATEGORIES
Inadequate integration with other tools,
reducing productivity and/or requiring
integration work
Often, exclusion of nondevelopers from
modeling efforts due to complexity of the tool
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THE GOOD NEWS
Development process productivity and qualityincreases are reliazable
Portability of new systems to other platform is
greatly enhanced Analyst skill set will improve due to greater
understanding of the process
Time to delivery of new applications willdecrease
Conformity to development standards willincrease
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THE BAD NEWS
Case acquisation costs are extremly high
Training of analyst and administrators is costlyand time consuming
Most organizations do not have clearstandards for application development
CASE tools can be viewed as a threat to jobsecurity
CASE tools do not have a great reputationsince early benefits are not realized