The Waterfall Model

24 Feb

Today I’m going to discuss the Waterfall Model which is one of the Traditional Method of the SDLC process along with the Spiral Model and V-Model.

The Waterfall Model was the first process model to be introduced. It illustrates the System Development process in a linear sequential flow (i.e. any phase in the development process begins only if the previous phase is complete). The Waterfall Model originates in the manufacturing and construction industries; highly structured physical environments in which after-the-fact changes are prohibitively costly, if not impossible. Since no formal software development methodologies existed at the time, this hardware-oriented model was simply adapted for software development.

When to use the Waterfall Model:

  1. Software technologies and tools are well-known.
  2. Product definition is stable.
  3. New version of the existing software system is being created
  4. There are no ambiguous requirements.

General Overview of The Waterfall Model:

Planning -> Analysis -> Logical Design -> Physical Design -> Implementation -> Maintenance

Advantages of The Waterfall Model:

  1. Easy to manage due to the rigidity of the model: each phase has specific deliverables and a review process.
  2. Phases are processed and completed one at a time. 
  3. Works well for smaller projects where requirements are very well understood.
  4. Simple and easy to use.

Disadvantages of The Waterfall Model:

  1. Once an application is in the testing stage, it is very difficult to go back and change something that was not well-thought out in the concept stage.
  2. No working software is produced until late during the life cycle.
  3. High amounts of risk and uncertainty.
  4. Not a good model for complex and object-oriented projects or for long and ongoing products.
  5. Not suitable for projects where requirements are at a moderate to high risk of changing.

In my next blog I will discuss the phases of the Waterfall Model in detail.

References:

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