Page 52 - DCAP405_SOFTWARE_ENGINEERING

Unit 3: Process Models

Notes
Figure 3.4: RAD Model

RAD Model Phases

RAD model has the following phases:
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.

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