The supplementary specification contains three major classes of software requirements. First, it contains those functional requirements that are not expressed in the use cases. Second, it contains nonfunctional requirements, those requirements that describe attributes of the system and of the systems environment, including items such as usability, reliability, and performance requirements, as well as legal, regulatory, and documentation requirements. Finally, the supplementary specification contains any design constraints imposed on the system or the development process used to develop the system. This document is updated as needed and is shared among team members and other involved personnel. The document template in this appendix is intended to be used as a starting point and may be customized according to your organization's needs.
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