Software Requirements - Ian Sommerville

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Non-functional requirements●●●These define system properties and constraintse.g. reliability, response time and storagerequirements. Constraints are I/O devicecapability, system representations, etc.Process requirements may also be specifiedmandating a particular CASE system,programming language or development method.Non-functional requirements may be more criticalthan functional requirements. If these are notmet, the system is useless.©Ian Sommerville 2004 Software Engineering, 7th edition. Chapter 6 Slide 16
Non-functional classifications●●●Product requirements• Requirements which specify that the delivered product mustbehave in a particular way e.g. execution speed, reliability, etc.Organisational requirements• Requirements which are a consequence of organisationalpolicies and procedures e.g. process standards used,implementation requirements, etc.External requirements• Requirements which arise from factors which are external to thesystem and its development process e.g. interoperabilityrequirements, legislative requirements, etc.©Ian Sommerville 2004 Software Engineering, 7th edition. Chapter 6 Slide 17
Page 1 and 2: Software Requirements©Ian Sommervi
Page 3 and 4: Topics covered●●●●●Functi
Page 5 and 6: What is a requirement?●●It may
Page 7 and 8: Types of requirement●●User requ
Page 9 and 10: Requirements readers©Ian Sommervil
Page 11 and 12: Functional requirements●●●Des
Page 13 and 14: Examples of functional requirements
Page 15: Requirements completeness and consi
Page 19 and 20: Non-functional requirements example
Page 21 and 22: Examples●●A system goal• The
Page 23 and 24: Requirements interaction●●Confl
Page 25 and 26: Library system domain requirements
Page 27 and 28: Domain requirements problems●●U
Page 29 and 30: Problems with natural language●
Page 31 and 32: Editor grid requirement2.6 Grid fac
Page 33 and 34: Structured presentation2.6.1 Grid f
Page 35 and 36: System requirements●●●●More
Page 37 and 38: Problems with NL specification●
Page 39 and 40: Structured language specifications
Page 41 and 42: Form-based node specificationInsuli
Page 43 and 44: Tabular specificationConditionActio
Page 45 and 46: Sequence diagrams●●●These sho
Page 47 and 48: Interface specification●●●Mos
Page 49 and 50: The requirements document●●●T
Page 51 and 52: IEEE requirements standard●Define
Page 53 and 54: Key points●●●●Requirements

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