CASE Tools and their importance.

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CASE Tools and their importance

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CASE tools stand for Computer Aided Software Engineering tools. As the name implies they are computer based programs to increase the productivity of analysts. They permit effective communication with users as well as other members of the development team. They integrate the development done during each phase of a system life cycle and also assist in correctly assessing the effects and cost of changes so that maintenance cost can be estimated.

Available CASE tools

Commercially available systems provide tools (i.e computer program packages) for each phase of the system development life cycle. A typical package is Visual Analyst which has several tools integrated together. Tools are also in the open domain which can be downloaded and used. However, they do not usually have very good user interfaces.

Following types of tools are available:

• System requirements specification documentation tool

• Data flow diagramming tool

• System flow chart generation tool

• Data dictionary creation

• Formatting and checking structured English process logic

• Decision table checking

• Screen design for data inputting

• Form design for outputs.

• E-R diagramming

• Data base normalization given the dependency information

When are tools used

Tools are used throughout the system design phase. CASE tools are sometimes classified as upper CASE tools and lower CASE tools. The tools we have described so far are upper CASE tools They are tools which will generate computer screen code from higher level descriptions such as structured English and decision tables, such tools are called lower CASE tools

Object Oriented System Design Tools

Unified Modelling Language is currently the standard. UML tool set is marketed by Rational Rose a company whose tools are widely used. This is an expensive tool and not in our scope in his course.

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