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Mastering Data Modeling: A User-Driven Approach by John Carlis

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Chapter 5. Visualizing Allowed and Disallowed Instances

There is more to reading an LDS than merely articulating the correct sentences. The sentences deserve scrutiny because they are pithy; that is by design. An LDS should be brief but richly substantive. Understanding the sentences means understanding their substance and all its ramifications.

When you read the LDS, either to yourself or aloud to someone else, you must be able to call attention to the ramifications of each sentence. Like the original sentences themselves, these ramifications are about what data the users want to remember. We describe in this chapter how to show typical and atypical data that an LDS accommodates—and how to show noteworthy data that an LDS cannot accommodate. ...

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