Requirements Specification

Requirements

• Range from a high-level abstract statement of service or system constraint to detailed mathematical functional specification

 

User Requirement Definition

• The software must provide a means of representing and accessing external files created by other tools.

 

System Requirement Specification

• The user shoud be provided with facilities to define the type of external files.
• Each external file type may have an aossociated tool which may be applied to the file.
• Each external file type may be represented as a specific icon on the user's display
• Facilities should be provided for the icon representing an external file type to be defined by the user.
• When a user selects an icon representing an external file, the effect of that selection is to apply the tool associated with the type of the external file to the file represented by the selected icon.

 

SRS Contents

• Software Requirements Specification should address:
  Functionality : what is the software supposed to do?
  External interfaces : how does the software interact with people, the system's hardware, other hardware? what assumptions can be made about these external entities?
  Required performance : what is the speed, availability, response time, recovery time of various software functions, and so on?
  Quality attributes : what are the portability, correctness, maintainability, security, and other considerations?
  Design constraints imposed on an implementation : are there any required standards in effect, implementation language, policies for database integrity, resource limits, operating environments and so on ?