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Software Process Models

Updated on May 14, 2015

Software Process Models

A process model is a conceptual representation of a development process. A development process is a set of activities, together with an ordering relationship between activities. Which if performed in a manner that satisfies the ordering relationship will produce the beloved product.

A software process model is specified in order to suggest an overall process for developing software.

Hence the different software processes include:

1) Classical Waterfall Model

2) Iterative Waterfall Model

3) Prototyping Model

4) Evolutionary Software Models

i. The Incremental Model

ii. The Spiral Model

iii. Win-Win Spiral Model

Classical Waterfall Model

It is also called as the classical life model, the linear sequential model or simply waterfall model is a methodical, chronological approach to software development that begins at the system level and progress through analysis, design, coding,

Testing and support.

Principal of Waterfall Processes

This process is characterized by three principles:

1) Sequential:

Sequential is prescribed as linear flow among phases. They prescribe that a phase should be accomplished before the next phases can be started, and each phase results in the preparation of one or more documents that form the input to the next phase.

2) Phase Based:

In this model, phases are organized in linear order. The linear sequence of activities performed in a software development project is: feasibility study, requirement analysis and project planning, system design, detailed design, coding and unit testing, system integration and testing.

3) Document Driven:

The result of the need for certification is that each phase must have some defined output can be evaluated and certified. That is, when the activities of a phase are completed there should be some product that is processed by that phase. And the goal of a phase is to construct this product. The output of the earlier phases is often called work products and is usually in the form of documents like the requirements document or design document. For the coding phase the output is code. For this point of view, the output of a software project is not just the final program along with the user documentation, but also the requirement document, design document, project plan, test plan, and test result.

Classical Waterfall Model

Classical Waterfall Model
Classical Waterfall Model | Source

Software development

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