Details About Software Requirement Specification

Dec, 21 2020, 01:22 pm [IST]
Details About Software Requirement Specification

Software requirements specification (SRS)

Software requirement specification at the result of the analysis task. The function and performance designated to the software are filtered by establishing an entire data description, detailed functional description, the presentation of system behavior, an indication of performance requirements and constraints, validation criteria, and others.

The outline of the software requirements specification is

  1. Introduction
  2. Information description
  3. Functional description
  4. Behavior description
  5. Validation and criteria
  6. Bibliography
  7. Appendix

The Introduction States the goals, objectives, software scope.

Information description provides a detailed description of the problem that the software must solve.

A description of each function required to solve the problem is presented in the functional description.

The behavioral description section of the specification examines the operation of the software as a consequence of external events and internally generated control characteristics.

Specification of validation criteria acts as an implicit review of software requirement specification is conducted by both software and customer. Because this situation makes the foundation for the design and the subsequent software engineering actions, the greatest care should be taken in handling the review.

Finally, the specification includes a bibliography and appendix. Bibliography refers to references for all documents related to the software. The appendix contains supplementary (additional) data needed.

Software requirement specification review (SRS)

Software requirement specification review and or prototype is conducted by both software developer and customer. The review is first conducted at a microscopic level. That is., reviewers attempt to ensure that specification is complete, consistent, and accurate when overall information, functional, and behavior domains orchestrated.

To fully explore each of the domains we review becomes more detailed. Once their view is complete, the software requirement specification is signed off by both customer and developer. The specification becomes a deal for software development. Request for changes in requirements after the specification is finalized will not be eliminated. But the customer should note that each such request is an extension of software scope and can result in an increase in cost and schedule. Modern software engineering environments use CASE tools to do software requirement specification review.

Characteristics of good software requirement specification

What should the software requirement specification address?

The basic issues that the software requirement specification writers cell address are the following:

Functionality - what is the software supposed to do?

External interfaces - how does the software interact with the people, the system's hardware, other hardware, and other software?

Performance - what is the speed, availability, response time, recovery time of various software functions, etc.,?

Attributes - what are the portability, correctness, maintainability, security, etc e., considerations?

Design constraints imposed on an implementation - are there are any required standards in effect, implementation language, colleges for database integrity, resource limits, operating environments, etc.?

Characteristics of a great software requirement specification:

A software requirement specification should be

  1. Correct
  2. Unambiguous
  3. Complete
  4. Consistent
  5. Tractor for importance and stability
  6. Verifiable
  7. Modifiable
  8. Traceable

Correct - this is like motherhood and apple pie. Of course, you want the specification to be correct. No one writes a specification that they know is incorrect. Like to say a correct and ever correcting. The discipline is keeping the specification up to date when you find things that are not correct.

Unambiguous - An software requirement specification is unambiguous if, and only if, every requirement stated therein has only one interpretation. Again, easier said than done. Spending time in this area before releasing the software requirement specification can be a waste of time. But as you find and ambiguities - fix them.

Complete - A simple judge of this is that it should be all that is needed by the software designers to create the software.

Consistent - the software requirement specification should be consistent within itself and consistent with its reference documents. If you call an input start and stop in one place, doesn't it call it to start and stop another?

Ranked for importance - very often a new system has requirements that are really marketing wishlist. Some may not be achievable. It is useful to provide this information in the SRS.

Verifiable - don't put in requirements like - " it should provide the user a fast response." another of my favorite is - " the system should never crash." instead, provide a quantitative requirement like: " keystroke should provide a user response within 100 milliseconds."

Modifiable - having the same requirement in more than one place may not be wrong - but it tends to make the document not maintainable.

Traceable - Often, this is not important in a non-politicized environment. However, in most organizations, it is sometimes useful to connect the requirements in the software requirement specification to higher-level documents.




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