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Class prototype
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Class prototype






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    Class prototype Class prototype Presentation Transcript

    • Prototyping  SDLC approach  Sample of system is prepared  Comprehensive system  Doesn't include all user requirements  Based on evolutionary method
    • Prototyping  Rapid software development to validate requirements  Help customers & developers understand the requirements for the system  Users can experiment with a prototype to see how the system supports their work  Prototype can reveal errors and omissions in the requirements
    • Prototyping  Considered as a risk reduction activity which reduces requirements risks  Used when all requirements cannot be identified and freezed initially  Throw-away model given to user  On the basis of feedback, actual system is developed
    • Prototyping  Misunderstandings between software users and developers are exposed  Missing services may be detected and confusing services may be identified  A working system is available early in the process
    • Prototyping  The throw-away prototype should NOT be considered as a final system  Some system characteristics may have been left out  There is no specification for long-term maintenance  The system will be poorly structured and difficult to maintain
    • Prototyping- 4 steps 1. Identify user’s basic information requirements 2. Develop initial Prototype system 3. Use of Prototype system to refine the user’s requirements 4. Revise & enhance Prototype system
    • Prototyping Establish prototype objectives Define prototype functionality Develop prototype Evaluate prototype Prototyping plan Outline definition Executable prototype Evaluation report
    • Prototyping- Step 1 1. Identify user’s basic information requirements  Form of outputs required from system  Based on users’ expectations, cost of workable prototype is calculated
    • Prototyping- Step 2 2. Develop initial Prototype system  Users’ basic information requirements  Minimum possible time  Efficiency is not main consideration
    • Prototyping- Step 3 3. Use of Prototype system to refine the user’s requirements  User gains hand-on experience on initially developed Prototype  Further refinements done, if required
    • Prototyping- Step 4 4. Revise & enhance Prototype system  Make necessary changes pointed by user after using Prototype  Steps 3 & 4 are repeated again & again  Refined as per user’s satisfaction
    • Prototyping Process Determine Requirements Requirements Construct Prototype Prototype Requirements Adjustments Demonstrate Prototype OK System Implementation
    • Prototyping Benefits •Improved system usability •Improved design quality •Developers learn from customers •Additional functionality neededPossible
    • Prototyping Benefits •Improved maintainability •Reduced overall development effort •“Try Out” ideas in limited cost •Functioning system into hands of user quickly
    • Prototyping Benefits •More Flexible •Steady, visible signs of progress •A more accurate end product •Users are actively involved in the development
    • Prototyping Benefits •Errors can be detected much earlier as the system is made side by side •Quicker user feedback is available leading to better solutions
    • Limitations Customer may want the prototype delivered Process may continue forever- Scope not well defined May increase the complexity of the system
    • When to use Requirements are unstable New, original development Develop user-interfaces
    • When not to use Requirements may change Return