The data model scorecard contains more than 400 rules to apply when reviewing a data model. One of these rules requires justifying optionality on a relationship. For example, on the model in Figure 1 we have these two business rules:
The circle on the relationship line implies zero. That is, a Customer can exist without ever placing an Order. In this example, we would ask the modeler the question, "When can a Customer exist without having placed an Order?"
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