Software Requirements - Ian Sommerville

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Requirement problems●●Database requirements includes both conceptual anddetailed information• Describes the concept of a financial accounting system that isto be included in LIBSYS;• However, it also includes the detail that managers canconfigure this system - this is unnecessary at this level.Grid requirement mixes three different kinds ofrequirement• Conceptual functional requirement (the need for a grid);• Non-functional requirement (grid units);• Non-functional UI requirement (grid switching).©Ian Sommerville 2004 Software Engineering, 7th edition. Chapter 6 Slide 32
Structured presentation2.6.1 Grid facilitiesThe editor shall provide a grid facility where a m atrix of horizontal andvertical lines provide a background to the editor window. This grid shall be apassive grid where the alignment of entities is the user's responsibility.Rationale: A grid helps the user to create a tidy diagram with well-spacedentities. Although an active grid, where entities 'snap-to' grid lines can be useful,the positioning is imprecise. The user is the best person to decide where entitiesshould be positioned.Specification: ECLIPSE/WS/Tools/DE/FS Section 5.6Source: Ray Wilson, Glasgow Office©Ian Sommerville 2004 Software Engineering, 7th edition. Chapter 6 Slide 33
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 and 16: Requirements completeness and consi
Page 17 and 18: Non-functional classifications●
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: Editor grid requirement2.6 Grid fac
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

Software Requirements - Ian Sommerville

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