Why do we use rules?
At this point, you might be still a bit puzzled about why rules are something useful. If we think of it, in terms of one rule or a few, we might consider it better to do it directly on the imperative code like Java, for example. As developers, we're used to break down the requirements into a list of steps to be followed and having to give away that control can be something intimidating.
However, the main strength behind business rules doesn't come from one rule or a small group of rules, it comes from a large, ever-changing group of rules that define a system so complex that it would require extensive work to maintain it if we did it with regular code.
Many rules can work together to define complex systems as the growth of the ...
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