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Waterfall model

The waterfall model is a traditional software development methodology that is often contrasted with Agile approaches.

The waterfall model is considered a more rigid, linear, and structured way of developing software, and follows a sequential set of phases, where each phase must be completed before moving on to the next one.

The waterfall model typically includes the following phases:

  1. Requirements analysis: This phase involves gathering and documenting the software requirements from the customer or end-user. This is a critical step, as the success of the project depends on accurately capturing the needs of the stakeholders.
  2. System design: In this phase, the development team creates the overall architecture and design of the software, including defining data structures, system modules, and interfaces.
  3. Implementation: During the implementation phase, developers write the source code for the software based on the design created in the previous phase.
  4. Testing: Once the software is coded, it undergoes various types of testing (unit, integration, system, and acceptance testing) to identify and fix defects and ensure the software meets the requirements.
  5. Deployment: After successful testing, the software is deployed to the production environment and made available to end-users.
  6. Maintenance: The final phase involves ongoing support and maintenance of the software, which includes fixing bugs, making updates, and implementing new features or enhancements as needed.

In the context of Agile, the waterfall model has several drawbacks, including:

  • Difficulty in accommodating changes: Due to its linear nature, making changes to requirements or design can be challenging and costly once the project has progressed past certain phases.
  • Delayed feedback: Since testing and deployment occur late in the process, it can take a long time before stakeholders see a working version of the software, making it difficult to provide timely feedback and address issues.
  • Increased risk: The long duration between phases and delayed feedback can result in a higher risk of delivering a product that does not meet the customer’s needs or expectations.

Agile methodologies, on the other hand, emphasize iterative and incremental development, collaboration, flexibility, and customer involvement throughout the development process. This approach allows Agile teams to adapt to changes more effectively, receive continuous feedback, and deliver working software more quickly compared to the waterfall model.


 

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