SOFTWARE DEVELOPMENT LIFE CYCLE


Introduction:

SDLC is a process followed for a software project, within a software organization. It consists of a detailed plan describing how to develop, maintain, replace and alter or enhance specific software.

The life cycle defines a methodology for improving the quality of software and the overall development process.

The various phases are: 

Planning and Requirement Analysis

§  Requirement analysis is the most important and fundamental stage in IDLC.

§  It is performed by the senior members of the team with inputs from the customer, the sales department, market surveys and domain experts in the industry.

§  Planning for the quality assurance requirements and identification of the risks associated with the project is also done in the planning stage.

§  The key questions which is discussed in this phase. These are: What is being done?

§  How is it being done?

§  How frequently does it occur?

§  How well is the task being performed?

§  What is the underlying cause?

Defining Requirements

§  Once the requirement analysis is done the next step is to clearly define and document the product requirements and get them approved from the customer or the market analysts.

§  This is done through Software Requirement Specification (SRS) document which consists of all the product requirements to be designed and developed during the project life cycle.

Designing the product architecture

§  SRS is the reference for product architects to come out with the best architecture for the product to be developed.

§  Based on the requirements specified in SRS, usually more than one design approach for the product architecture is proposed and documented in a DDS – Design Document Specification.

§  A design approach clearly defines all the architectural modules of the product along with its communication and data flow representation with the external and third party modules

§  The internal design of all the modules of the proposed architecture should be clearly defined with the minutes of the details in DDS.

Developing the Product

§  In this stage of SDLC the actual development starts and the product is built. The programming code is generated as per DDS during this stage.

§  If the design is performed in a detailed and organized manner, code generation can be accomplished

§  Developers have to follow the coding guidelines defined by their organization and programming tools like compilers, interpreters, debuggers etc are used to generate the code.

§  Different high level programming languages such as C, C++, Pascal, Java, and PHP are used for coding.

Testing the Product

§  This stage is usually a subset of all the stages as in the modern SDLC models, the testing activities are mostly involved in all the stages of SDLC.

§  However this stage refers to the testing only stage of the product where products defects are reported, tracked, fixed and retested, until the product reaches the quality standards defined in the SRS.

Deployment in the Market and Maintenance

§  Once the product is tested and ready to be deployed it is released formally in the appropriate market. Sometime product deployment happens in stages as per the organizations. Business strategy.

§  The product may first be released in a limited segment and tested in the real business environment.

§  Then based on the feedback, the product may be released as it is or with suggested enhancements in the targeting market segment.

§  After the product is released in the market, its maintenance is done for the existing customer base.

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