TAILIEUCHUNG - Lecture Software requirements engineering - Lecture­ 22: Requirements specification

After this chapter the student should have acquired the following knowledge and skills: Specifying NFRs, specifying NFRs for safety critical systems, requirements validation, NFRs for critical systems, usability metrics, safety requirement definition, non-functional requirements checklist,. | Requirements Specification Lecture-22 Recap 2 Specifying NFRs Deriving NFRs Concern decomposition Goal decomposition Specifying NFRs for safety critical systems Today’s lecture 3 Specifying NFRs Specifying NFRs for safety critical systems Requirements validation NFRs for critical systems A failure of a critical system may result from a failure to meet a functional requirement but, more often, it results from a failure of the system to satisfy some non-functional constraint on its operation. The principal non-functional constraints which are relevant to critical systems: Reliability Performance Security Usability Safety Reliability Constraints on the run-time behaviour of the system Can be considered under two separate headings: Availability - is the system available for service when requested by end-users. Failure rate - how often does the system fail to deliver the service expected by end-users. Reliability requirements can often be expressed quantitatively. Availability may be .

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