BCS/CER/IS/DIP/SE1/ Prototype Model

Prototype Model

Prototyping is a working model of a real system. There are two types of prototypes. The basic idea here is that instead of freezing the requirements before a design or coding can proceed, 

• Throw-away prototype
• Evolutionary Prototype 

Throw-away prototype
Model is use to gather requirements, after gathering requirements development start from the beginning. 

Evolutionary Prototype
Model is use to get the user feedback and finalize the model and deliver the system

Throwaway prototype is built to understand the requirements. This prototype is developed based on the currently known requirements. By using this prototype, the client can get a “what users really want” of the system, since the interactions with prototype can enable the client to better understand the requirements of the desired system.  Prototyping is an attractive idea for complicated and large systems.

Advantages of Prototype model:

• Users are actively involved in the development
• Since in this methodology a working model of the system is provided, the users get a better understanding of the system being developed.
• Errors can be detected much earlier.
• Quicker user feedback is available leading to better solutions.
• Confusing or difficult functions can be identified
• Requirements validation, Quick implementation of, incomplete, but functional, application.

Disadvantages of Prototype model:

• Leads to implementing and then repairing way of building systems.
• Increase the complexity of the system as scope of the system may expand beyond original plans.