Requirement specification

 

Requirement specification :

Requirements play a driving role during product creation. The requirements are

captured in a requirements specification. The objectives of the project are carefully defined in terms of functional requirements, quality requirement and resource requirements.

  • Functional requirements: These define what the end product of the project is to do. Systems analysis and design methods, such as SADT and Information Engineering are designed primarily to provide functional requirements.
  • Quality requirements:  There will be other attributes of the application to be implemented that do not relate so much to what the system is to do but how it is to do. These are still things that the user will be able to experience. They include, for example, response time, the ease of using the system and its reliability.
  • Resource requirement: A record of how much the organization is willing to spend on the system. There may be trade off between this and the time it takes to implement the system. In general it costs disproportionately more to implement a system by an earlier date than later one. There may also be a trade-off between the functional and quality requirements and cost. We would all like exceptionally reliable and user friendly system which do exactly do exactly what we want but we may not be able to afford them.

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