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Prototype model


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Prototype model

  1. 1. Overviews:- What is prototype model? Need / importance of the prototype model Advantage and disadvantage of the prototype model Reference
  2. 2. Sdlc models SDLC(Software development life cycle) is a framework that describes the activities performed at each step of a software development project. SDLC models are following types:- Waterfall model Iterative model Prototype model Spiral model
  3. 3. SDLC MODEL
  4. 4. Prototype model  A prototyping model suggest that before carrying out the development of the actual software, a working prototype of the system should be built.  A prototype is a toy implementation of the system.  Prototype is a working model of software with some limited functionality. Prototyping is used to allow the users evaluate the developer proposals and try them out before implementation.
  5. 5. How does the prototype model look?  aa Requirement analysis quick design Build prototype Customer evaluation of prototype Refine requirements according to the customer suggestion Design Implement Test Maintain
  6. 6. Steps of the prototype model  Requirements gathering and Analysis: A prototype model begins with requirements analysis, and the requirements of the system are define in detail. The user is interviewed in order to know the requirements of the system.  Quick design: When requirements are known, a quick design for the system is created. It is not a detailed design , it includes the important aspects of the system, which gives an idea of the system to the user.
  7. 7.  Build prototype: Information gathering from quick design is modified to form a prototype .It represents a ‘rough’ design of the required system.  Customer evaluation of prototype: The build prototype is presented to the customer for his/her evaluation.  Prototype refinement: Once the user evaluate the prototype, it is refined according to the requirements . When the user is satisfied to the developed prototype , a final system is developed based on the final prototype , which is developed by the iterative method means we design the system according to the final prototype , after that implement , test the product to find the error and at last we maintain the system.
  8. 8. Need of the prototype model:-  Prototype provides a method to examine design problems and evaluating solutions.  “…Prototypes are not self explanatory….Clarifying what aspects of a prototype correspond to the eventual artifact─ and what don’t─ is a key part of successful prototyping.”  The development of the prototype model is expensive but is a good model because it satisfy all the requirements of the customers.
  9. 9. Advantages of the prototype model:-  It provides a working model to the user early in the process , enabling early assessment and increasing the user confidence.  The developer gains the experience and insight by developing a prototype , thereby resulting I better implementation of the requirements.  It helps in reducing the risk associated to the project.  The prototyping model serves to clarify requirements , which are not clear, hence ambiguity and improving communication between developer and user.
  10. 10.  There is a great involvement of the users in software development. Hence the requirements of the users are met to the greatest extent.
  11. 11. Disadvantages of the prototype model  If the user is not satisfied with developed prototype, then a new prototype is developed . This process goes on until a perfect prototype evolves. Thus this model is time consuming and expensive.  The developer loses focus of the real purpose of the prototype and compromises on the quality of the product. For example:- he/she may apply some of the inefficient algorithms or inappropriate programming languages used in developing the prototype.
  12. 12. Prototype model can lead to the false expectations. It often creates a situation where the user believes that the development of the system is finished when it is not. The primary goal of the prototype model is rapid development. Thus, the design of the system may suffer as it built in a series of layers without considering integration of all the other components.
  13. 13. References   
  14. 14. thank you