12     MODELLING REQUIREMENTS

Debra Paul and James Cadle

INTRODUCTION

This chapter introduces some of the most commonly used techniques for modelling requirements for IT systems. These techniques are used to analyse and specify requirements during systems development. Models are extremely useful in helping to clarify understanding and, if cross-checked with other models, ensuring the completeness of the analysis. A model shows only one view, or perspective, of a system but shows this view very clearly. This induces the analyst to ask further questions, often those that have not been identified previously. The techniques we describe here have been selected from two distinct approaches to systems modelling: use case diagrams and class modelling ...

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