4 DRAWING AND VALIDATING INFORMATION MODEL DIAGRAMS

This chapter introduces a process for drawing an information model. It then considers two techniques for validating an information model – the data navigation path (sometimes called a query access path or an enquiry access path) and the CRUD (Create-Read-Update-Delete) matrix.

THE MODEL DRAWING PROCESS

There are many different approaches to drawing an information model. The more experienced modellers will draw on many of these approaches during any set of modelling sessions. What all of these approaches have in common, however, is that none of them will allow you to arrive at a final model in one go. The very act of modelling will raise further questions, the answers to which will often, ...

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