Sequential Lifecycle Models

Sequential Lifecycle Models
The software development lifecycle begins with the identification of a requirement for software and ends with the formal verification of the developed software against that requirement. Traditionally, the models used for the software development lifecycle have been sequential, with the development progressing through a number of well defined phases.

The sequential phases are usually represented by a V or waterfall diagram. These models are respectively called a V lifecycle model and a waterfall lifecycle model.There are in fact many variations of V and waterfall lifecycle models, introducing different phases to the lifecycle and creating different boundaries between phases.

The following set of lifecycle phases fits in with the practices of most professional software developers.

• The Requirements phase, in which the requirements for the software are gathered and analyzed, to produce a complete and unambiguous specification of what the software is required to do.The Architectural Design phase, where software architecture for implementation of the requirements is designed and specified, identifying components within the software and the relationships between the components.The Detailed Design phase, where the detailed implementation of each component is specified.

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