about software engineering

1. Software Tools and Environments
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2. Computer-Aided Software Engineering: CASE tools
Used to support or automate activities throughout the systems
development life cycle (SDLC)
A CASE repository is a system developers’ database.
It is a place where developers can store system models, detailed
descriptions and specifications, and other products of system
development..
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3. Computer-Aided Software Engineering: CASE tools
Forward engineering requires the systems analyst to draw system
models, either from scratch or from templates. The resulting models
are subsequently transformed into program code.
Reverse engineering allows a CASE tool to read existing program
code and transform that code into a representative system model that
can be edited and refined by the systems analyst.
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4. Objective of CASE tools
 Improve quality of systems to be developed
Increase speed of development and design
Ease and improve testing process through automated checking
Improve integration of development activities via common
methodologies
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5. Objective of CASE tools
Improve quality and completeness of documentation
Help standardize the development process
Improve project management
Promote reusability and Improve software portability
Increase productivity and Improve overall quality of systems
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6. Components of CASE tools
Upper CASE:CASE tools designed to support the information
planning and the project identification and selection, project
initiation and planning, analysis and design phases of the systems
development life cycle
Lower CASE:CASE tools designed to support the implementation
and maintenance phases of the systems development life cycle
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7. Components of CASE tools
Cross life-cycle CASE:CASE tools designed to support activities
that occur across multiple phases of the systems development life
cycle
Most CASE tools utilize a repository to store all diagrams, forms,
models and report definitions
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8. Components of CASE tools

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9. CASE versus Traditional Systems Development
 Traditional Systems Development
Traditional approach does not offer support for integration of
specification documents
Often, documentation is done after coding is completed in
traditional systems development
Traditional approach often leads to out- of-date documentation
Paper-based specifications, Manual coding of programs
Manual documenting, Intensive software testing
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10. CASE versus Traditional Systems Development
CASE-Based Systems Development
Emphasis on analysis and design
 Rapid interactive prototyping
Automated code generation,
Automated documentation generation
Automated design checking,
Maintain design specifications
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11. Types of CASE tools
Diagramming tools
Computer display and report generators
Analysis tools used to check for incomplete, inconsistent or
incorrect specifications
A central repository
Documentation generators
Code generators
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12. CASE diagraming and prototyping tools
Enable representation of a system and components visually
Effective for representing process flows,
data structures and program structures
Types
 Data Flow Diagrams (DFD) e.g pencil
Functional Hierarchy Diagrams
Entity-Relationship Diagrams
e.g visual paradigm, ArgoUML
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13. CASE Form ,document and Report generator tools
CASE tools that support the creation of system forms and reports in
order to prototype how systems will look and feel to users
Two Purposes
Create, modify and test prototypes of computer display forms and
reports
Identify which data items to display or collect for each form or
report
E.g. Portus, DrExplain
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14. CASE Analysis tools
Enable automatic checking for incomplete, inconsistent or incorrect
specifications in diagrams, forms and reports.
Types of analyses vary depending on the organization’s
development methodology and features of CASE environment
e.g spreadsheet
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15. CASE code generation and visual development tools
Enable the automatic generation of program and database
definition code directly from the design documents, diagrams,
forms and reports stored in the repository
E.g. visual studio, NetBeans
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16. CASE quality assurance tools
Quality assurance in a software organization is monitoring the
engineering process and methods adopted to develop the software
product in order to ensure conformance of quality as per organization
standards.
Examples
JMeter
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17. CASE maintenance tools
Software maintenance includes modifications in the software
product after it is delivered.
Examples
Bugzilla for defect tracking.
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18. CASE tools limitations
May be difficult to customize/complex
Requires training of maintenance staff
May be difficult to use with existing systems
It is costly if it is proprietary tool.
Good quality CASE tools are very expensive.
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19. Thank you !!!
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