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Unit 4 Software development Models (Class 12 SEP)

  Software development Model

Software development models are various processes or methods that are chosen for project development depending on the objectives and goals of the project. Many development life cycle models have been developed to achieve various essential objectives. Models specify the various steps of the process and the order in which they are executed.

The few software development models are discussed below:

Waterfall Model (SDLC Model)

The Waterfall Model is a traditional software development model in which the project is developed in sequential phases. Each phase must be completed before moving to the next phase, and there is usually no going back once a phase is completed. It is one of the earliest SDLC (Software Development Life Cycle) models.

1. Features of Waterfall Model

  1. Sequential Phases: Development progresses in a fixed order:
    • Requirements → Design → Implementation → Testing → Deployment → Maintenance
  2. Clear Documentation: Each phase produces formal documentation that guides the next phase.
  3. Easy to Understand & Manage: Because of its step-by-step approach, project progress is easy to monitor.
  4. Well-defined Requirements: Works best when requirements are clear and unlikely to change.
  5. Phase Completion: Each phase has specific deliverables and milestones.

 

2. Advantages of Waterfall Model

  1. Simple & Easy to Use: Very straightforward; easy for developers and managers to understand.
  2. Structured & Disciplined: Clear documentation and defined phases make project management easier.
  3. Early Detection of Errors: Errors in a phase can be detected before moving to the next phase.
  4. Ideal for Small Projects: Works well when requirements are well-known and stable.
  5. Progress Tracking: Easy to measure progress by checking completion of each phase.

 

3. Disadvantages of Waterfall Model

  1. Inflexible to Changes: Once a phase is completed, going back to make changes is difficult and costly.
  2. Poor for Complex Projects: Not suitable for large projects with evolving requirements.
  3. Late Testing Feedback: Testing is done after implementation, so defects may be discovered late.
  4. Customer Feedback Delayed: The client sees the final product only after the implementation phase.
  5. High Risk: If requirements are misunderstood initially, it can lead to project failure.

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