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Software development is the process of developing software through successive phases in an orderly way. This process includes not only the actual writing of code but also the preparation of requirements and objectives, the design of what is to be coded, and confirmation that what is developed has met objectives.

Before systems development methods came into being, the development of new systems or products was often carried out by using the experienceand intuition of management and technical personnel. However, the complexityof modern systems and computer products long ago made the need clear forsome kind of orderly development process.

The software development process is almost invariably guided bysome systematic software development method (SDM). Referred to by a numberof terms, including process models, development guidelines,and systems development life cycle models (SDLC), software development methods nevertheless generally include the same development phases:

Open source software is developed collaboratively; source code is freely available for use and modification. The open source movement arose because some developers came to believe that competition amongst vendors leads to inferior products and that the best approach to development isa collaborative one.

Typical phases of software development:

1) Identification of required software

2) Analysis of the software requirements

3) Detailed specification of the software requirements

4) Software design

5) Programming

6) Testing

7) Maintenance