Introduction to RAD Model
RAD rapid application development, a methodology that has the same objective of speedy response to user needs as does prototypes but is broader in scope. The RAD term was coined by computer consultant and author James martin RAD refers to a development life cycle intended to produce system quickly without sacrificing quality:
RAD model is an incremental model combing water fall model with components based development model which:
All the phases are discussed below one by one:
1. Business modelling: In this phase the information flow among the various functions is described. This information will be generated and processed by software engineers. It is to be checked from where that information is created and where it will go.
2. Data modelling: To refine the information flow of the previous phase, it is partitioned into different data objects. Each data object may have the various attributes and then the relationships and connections are made among these data objects.
3.Process modelling : the data objects of data modelling phase are now combined to provide the information flow of each business function. Some documents and reports are prepared for addition, updating, editing like, deletion, creation and retrieval of the data objects.
BM: Business Modelling
DM: Data Modelling
PM: Process Modelling
AG: Application Generation
T&T: Testing and Turnover
4. Application Generation: As previously mentioned, this model uses the concept of reusability. So the product is built using the new components as well as some already existing components. If any new built components of this business application is found to be important then it can be stored in the library or data store for the later.
Projects and future use. Now this component will act as reusable components in any other new project.
5. Testing and Turnover: Now, the unit testing is done where all the new built components are tested. The existing ones need not to be tested because that have already been tested in their previous projects. So this reduces the overall testing time. After that all components are merged together to form an integrated one. Now this integrated system will be tested against the mentioned requirements for their fulfilment and satisfaction. In this way, the whole business application is developed and it is now delivered to the customer.
RAD model is built in the time constraints i.e. of2to 3 month. So if a business application is divided into its various functions, each of the function must be completed within three month times. If is not completed within this time limitation then that application is not RAD model based.
Advantages
Disadvantage
Risk Handling: RAD is not appropriate when the technical risks are high. These risks occur due to more use of new technology or when any new software requires high interoperability with the existing programs. So when the technical risks become reality, implementation may become impossible.
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