Waterfall Model in SDLC: SDLC has various models designed which have their advantages and disadvantages. Waterfall model is a traditional SDLC model which will be discussed in this tutorial. It’s a straightforward and basic structure which can be effectively understandable by software developers and testers. It is the first model of SDLC to be presented for software development.

What is The Waterfall Model?

WATERFALL MODEL is a sequential model that divides software development into pre-defined phases. Each phase should be finished before the next phase can start with no cover between the phases. Each phase is designed for performing specific activity during the SDLC phase. It was presented in 1970 by Winston Royce.

Different Phases of Waterfall Model in Software Engineering

Different phases

Activities acted in each stage

Necessity Gathering stage

During this phase, point by point necessities of the software system to be
developed are gathered from client

Design Stage

Plan the programming language, for Example Java, PHP, .net

or then again database like
Oracle, MySQL, and so on

Or on the other high-level
technical technical details of the project

Build Stage

After design stage, it is built stage, that is only coding the software

Test Stage

In this stage, you test the software to confirm that it is worked
according to the details given by the client.

Deployment stage

Deploy the application in the respective environment

Maintenance stage

When your system is prepared to use, you may later require change the code
according to client request

When to use SDLC Waterfall Model

Waterfall model can be used when

• Requirements are not changing often

• Application isn’t complicated and big

• Project is short

• Requirement is clear

• Environment is steady

• Technology and tools used are not dynamic and is steady

• Resources are accessible and prepared

Advantages and Disadvantages of Waterfall-Model

• Before the next phase of development, each stage should be completed• Error can be fixed only during the phase
• Suited for more smaller projects where necessities are well defined• It isn’t attractive for complex project where prerequisite changes as often as possible
• They ought to perform quality assurance test (Verification and Validation) before to finishing each stage• Testing period comes quite late in the developmental process
• Elaborate documentation is done at each phase of the software’s development cycle• Documentation involves a lot of time of developers and testers
• Project is totally subject to extend team with minimum client intervention• Clients significant feedback can’t be incorporated with ongoing development stage
• Any changes in software is made during the process of the development• Small changes or errors that arise in the finished software may cause a lot of issues


SDLC: Phases & Models of Software Development Life Cycle

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10 Steps to Become a Software Engineer/Developer

What is Software Engineering? Definition, Basics, Characteristics

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