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The RAD modelis a linear sequential software development process
that emphasizes an extremely short development cycle. The RAD model is
a "high speed" adaptation of the linear sequential model in which rapid
development is achieved by using a component-based construction
approach. Used primarily for information systems applications, the RAD
approach encompasses the following phases:
1. Business modeling
The information flow among business functions is modeled in a way that answers the following questions:
What information drives the business process?
What information is generated?
Who generates it?
Where does the information go?
Who processes it?
2. Data modeling
The information flow defined as part of the business modeling phase is
refined into a set of data objects that are needed to support the
business. The characteristic (called attributes) of each object is
identified and the relationships between these objects are defined.
3. Process modeling
The data objects defined in the data-modeling phase are transformed to
achieve the information flow necessary to implement a business
function. Processing the descriptions are created for adding,
modifying, deleting, or retrieving a data object.
4. Application generation
The RAD model assumes the use of the RAD tools like VB, VC++, Delphi
etc... rather than creating software using conventional third
generation programming languages. The RAD model works to reuse existing
program components (when possible) or create reusable components (when
necessary). In all cases, automated tools are used to facilitate
construction of the software.
5. Testing and turnover
Since the RAD process emphasizes reuse, many of the program components
have already been tested. This minimizes the testing and development
time.
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