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An overview of attention points is given in the Sidebar, "Verification Checks." If one of the listed attention points is found in a ruleset, the statement should be checked to see if it needs modification.
One of the characteristics of the business rules approach is that business people are in charge of specifying business rules.
A quality check is especially important for the acceptance of the business rules by other people -- people who where not involved in the process of gathering the business rules but who need to continue their work based upon the rules, for example, an IT department that is supposed to implement the business rules in a new IT system, or a manager who must communicate the rules to workers who will use the rules in their day-to-day work.
We will see in the coming examples that the quality check is also important when rules change, so that the effects of a new rule on an existing set of rules can be assessed.
In this section, you'll learn how to use the primary key field to help enforce a business rule.
You'll learn how to use the non-key field later in Chapter 12.