![]() It delays the testing phase which can discover a lot of issues in requirements, design, and implementation as well.It requires more time for the detailed plan upfront of the project, as the requirements are clear and frozen and it should be visible to have the detailed plan delivered to the customer.A little flexibility and adjusting scope is difficult and expensive.It assumes that the requirements of a system can be frozen without any changes or enhancements.It is very difficult to go back to any phase after it finished.It takes the full lifecycle to deliver a workable solution to the customer.Validation and verification at each phase ensure early detection of errors/misunderstanding at the same phase.It is easier for project managers to plan, schedule the project, utilize the resources, and define the milestones easily.Stages and activities are well defined.It is very easy to explain to the business users and explain the output of each phase.Professional Project management skills.The project cannot be delivered in an iterative manner.Technology is understood and used by the team in different projects.You can review the selection criteria for the SDLC models from this article, while this is the list of things to consider when using the waterfall: We can notice some similarities of these types of projects that they cannot be delivered in iterative, incremental, or agile manner, for example, in embedded systems for the elevator, you cannot deliver an elevator who can go up only without going down, or handling only users requests from inside and ignore outside calls for the elevator. Mission Critical projects, for example, in a Space shuttle.Projects initiated from a request for proposal (RFP), the customer has a very clear documented requirements. ![]() ![]() The usage of the waterfall model can fall under the projects which do not focus on changing the requirements, for example: Although, this is can be very rigid in some software projects which need some flexibility, while, this model can be essential or the most suitable model for other software projects’ contexts. When to use Waterfall Model?ĭue to the nature of the waterfall model, it is hard to get back to the previous phase once completed. Waterfall Model contains the main phases similarly to other process models, you can read this article for more information about phases definitions. In this article, we will discuss the advantages and disadvantages of the waterfall, should we avoid it? when to use it? and the waterfall model pitfall, and why I see it as the father of the SDLC models. The waterfall approach does not define the process to go back to the previous phase to handle changes in requirement. This means that any phase in the development process begins only if the previous phase is complete. In which progress is seen as flowing steadily downwards (like a waterfall) through the phases of software implementation. The Waterfall Model is a linear sequential flow. You can read this Wikipedia page to know the waterfall model history. Moreover, it was the first introduced presentation of the software lifecycle. It is mostly known as the traditional software development process model, widely used until now, and the most popular SDLC model and the one you should avoid to use. What is the Waterfall Model (Waterfall Methodology)?
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