Algorithm for software implementation - Software Specification & Measurement

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• Nirja Shah   -Posted on 06 Oct 15
  Software requirements specification (SRS)
  - It is a description of a software system to be developed, laying out functional and non-functional requirements, and may include a set of use cases that describe interactions the users will have with the software.
  
  - It establishes the basis for an agreement between customers and contractors or suppliers on what the software product is to do as well as what it is not expected to do.
  
  - They permit a rigorous assessment of requirements before design can begin and reduces later redesign.
  
  - It should also provide a realistic basis for estimating product costs, risks, and schedules.
  
  - The SRS document enlists enough and necessary requirements that are required for the project development.
  
  - To derive the requirements we need to have clear and thorough understanding of the products to be developed or being developed.
  
  - This is achieved and refined with detailed and continuous communications with the project team and customer till the completion of the software.
  
  - The SRS may be one of a contract deliverable Data Item Descriptions or have other forms of organizationally-mandated content.
  
  - An example organization of an SRS is as follows:
  
  1. Introduction
  - Purpose
  - Definitions
  - System overview
  - References
  2. Overall description
  - Product perspective
  - System Interfaces
  - User Interfaces
  - Hardware interfaces
  - Software interfaces
  - Communication Interfaces
  - Memory Constraints
  - Operations
  - Site Adaptation Requirements
  - Product functions
  - User characteristics
  - Constraints, assumptions and dependencies
  3. Specific requirements
  - External interface requirements
  - Functional requirements
  - Performance requirements
  - Design constraints
  - Standards Compliance
  - Logical database requirement
  4. Software System attributes
  - Reliability
  - Availability
  - Security
  - Maintainability
  - Portability
  5. Other requirements

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