RAD Model BY - Dhivakaran.JM

Definition: Rapid application development RAD is incremental software development process model that allows usable systems to be built in as little as 60-90 days. The RAD model used for information systems development.

Model Phases Business modeling Data modeling Process modeling Application generation Testing and turnover

Business Modeling: The information flow among business functions is defined by answering questions like what information drives the business process, what information is generated, who generates it, where does the information go, who process it and so on.

Data Modeling The information collected from business modeling is refined into a set of data objects (entities) that are needed to support the business. The attributes (character of each entity) are identified and the relation between these data objects (entities) is defined

Process Modeling The data object defined in the data modeling phase are transformed to achieve the information flow necessary to implement a business function. Processing descriptions are created for adding, modifying, deleting or retrieving a data object

Application Generation Automated tools are used to facilitate construction of the software; Even they use the 4th GL techniques.

Testing and Turn over Many of the programming components have already been tested since RAD emphasis reuse. This reduces overall testing time. But new components must be tested and all interfaces must be fully exercised.

Structure of RAD

The key players in a RAD Sponsor Requirements Planning Team User Design Team User Review Board Training Manager Project Manager Construction (SWAT) Team Workshop Leader

RAD Requirements CASE tool – CASE Maker's Totem 5.0 ,Rational rose Data dictionary Storyboard Risk Register

Case Tools working examples

Development model based on RAD Agile software development Joint Application Development (JAD) Scrum Extreme Programming (XP)

Advantages: Quick initial reviews are possible Constant integration isolate problems and encourage customer feedback

Disadvantage Requires a systematic approach for modularized Requires highly skilled and well-trained developers

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