introduction to ACCA - developing systems Session 22 of the...

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48 student accountant January 2006 technical Session 22 of the Study Guide for Paper 2.1, Information Systems is concerned with quality assurance in the management and systems development process. One of the detailed objectives of this session is to ‘describe the V model and its application to quality assurance and testing’. the V model relevant to Professional Scheme Paper 2.1 developing systems The V model is commonly used to identify the relationship between the development and testing phases, and to ensure that appropriate quality assurance and testing takes place throughout the project lifecycle. An example V model is shown in Figure 1 on page 50. In this diagram, the term ‘Requirements specification’ is used to define the agreed business requirements of the organisation. Two example requirements are given below: the exams administration system shall record the dispatch of scripts to markers the exams administration system shall record the marks of candidates. These business requirements form the basis of (user) acceptance testing. Requirements are developed in detail in the stage that culminates in the ‘Functional specification’. During this stage, process, structural and event models are developed so that the requirements are understood in detail. Diagrams such as flowcharts ( Study Guide Session 12), entity-relationship models ( Study Guide Session 13) and statechart diagrams ( Study Guide Session 14) are used to model the requirements. These models also provide the basis of the test cases subsequently used in system testing. A key issue in this stage is the ‘testability’ of the functional specification. If the specification is loosely defined then it cannot be easily tested. Therefore, the specification will be easier
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introduction to ACCA - developing systems Session 22 of the...

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