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International Standard IEEE 1233
IEEE Guide for Developing System Requirements Specifications
Guidance for the development of the set of requirements, the System Requirements Specification (SyRS), that will satisfy an expressed need is provided. Developing a SyRS includes the identification, organization, presentation and modification of the requirements. Also addressed are the conditions for incorporating operational concepts, design constraints and design configuration requirements into the specification. This guide also covers the necessary characteristics and qualities of individual requirements and the set of all requirements.
Online IEEE Catalog: http://standards.ieee.org/findstds/standard/1233-1996.html