20BUSINESS RULES
If we are going to divide our application into business rules and plugins, we’d better get a good grasp on just what business rules actually are. It turns out there are several different kinds.
Strictly speaking, business rules are rules or procedures that make or save the business money. Very strictly speaking, these rules would make or save the business money, irrespective of whether they were implemented on a computer. They would make or save money even if they were executed manually.
The fact that a bank charges N% interest for a loan is a business rule that makes the bank money. It doesn’t matter if a computer program calculates ...
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