Essence Of Waterfall Model


SDLC is a process through which a product will get completed or a product get rid from any problem. Software development process is described as a number of phases, procedures and steps that gives the complete software. SDLC follows series of steps which is used for product progress. It is nothing but a ladder for project management in an organized manner. Now-a-days a number of different process models are followed. Some of those are:

(i)Waterfall Model

(ii)Spiral Model


(iv)Iterative Model


Spiral Model: Spiral model is nothing but the royal combination of Waterfall Model with Risk Analysis factor. It follows four phases like planning, Risk Analysis, Engineering and Evaluation. In large projects this model is preferable.

RAD: RAD or Rapid Application Development explains the model itself. For rapid development of projects in time we prefer this model. In other words we can say RAD is a variation of the Prototyping Model. But it strictly follows time constraint on each phase for quick development of project.

Iterative Model: Iterative Model is the combination some mini-Waterfall Model in each iteration. Though it is looking more effective but the time factor, steps followed and delay in each phase matters here.

V-Model: V model is the classic software development model. It encapsulates the steps in Verification and Validation phases for each step in the SDLC. For each phase, the subsequent phase becomes the verification (QA) phase and the corresponding testing phase in the other arm of the V becomes the validating (Testing) phase.

Waterfall Model:

Apart from these known models there are several other models are used by the software industry depending on the project size, time and budget. Here I put a glance on well known Waterfall model. It is a unique model which is followed by most of the companies. In fact certain features of Waterfall attracts the top executives to adapt it. Some of the unique features are:

1.It can be implemented for all size project.

2.It leads to a concrete and clear approach to software development.

3.In this model testing is inherent in every phase.

4.Documentation is produced at every stage of model which is very helpful for people who are involved.

There are various phases can be maintained in Waterfall model:

(i)Preliminary investigation and feasibility analysis.

(ii)Requirement Analysis

(iii)System design


(v)Integration and testing

(vi)Implementation and maintenance

[Preliminary Investigation]


[Requirement Analysis]


[System Design]




[Integration & Testing]


[Implementation & Maintenance]

(Waterfall Model Diagram)

One important thing of the Waterfall Model is that at each phase a conscious decision is taken whether to continue the project or to stop it.

Phase1–> Preliminary Investigation:

It is the starting phase of project. Actually it is the job of top executives. The aim of this phase is not develop system but to investigate the problem or to take decision for new requirements. When the executives are taking decisions on a project they take various factors in to consideration, like Technology, Time, Budget..

When the agreement has …