Properties of a good SRS document

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The important properties of a good SRS document are the following:

  • Concise. The SRS document should be concise and at the same time unambiguous, consistent, and complete. Verbose and irrelevant descriptions reduce readability and also increase error possibilities.
  • Structured. It should be well-structured. A well-structured document is easy to understand and modify. In practice, the SRS document undergoes several revisions to cope up with the customer requirements. Often, the customer requirements evolve over a period of time. Therefore, in order to make the modifications to the SRS document easy, it is important to make the document well-structured.
  • Black-box view. It should only specify what the system should do and refrain from stating how to do these. This means that the SRS document should specify the external behavior of the system and not discuss the implementation issues. The SRS document should view the system to be developed as black box, and should specify the externally visible behavior of the system. For this reason, the SRS document is also called the black-box specification of a system.
  • Conceptual integrity. It should show conceptual integrity so that the reader can easily understand it.
  • Response to undesired events. It should characterize acceptable responses to undesired events. These are called system response to exceptional conditions.
  • Verifiable. All requirements of the system as documented in the SRS document should be verifiable. This means that it should be possible to determine whether or not requirements have been met in an implementation.

Problems without a SRS document

The important problems that an organization would face if it does not develop an SRS document are as follows:

  • Without developing the SRS document, the system would not be implemented according to customer needs.
  • Software developers would not know whether what they are developing is what exactly required by the customer.
  • Without SRS document, it will be very much difficult for the maintenance engineers to understand the functionality of the system.
  • It will be very much difficult for user document writers to write the users' manuals properly without understanding the SRS document.

 

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Properties of a good SRS document

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This article was published on 2010/12/09