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Editorial Team
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Asked: 2026-05-13T12:45:06+00:00

I am working on a decision engine / rule evaluation engine. For example: Input:

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I am working on a decision engine / rule evaluation engine. For example:

Input: Customer and all the offences done by the customer

Output: Consequences of the offences

A sample case would be:

Input: Customer(Jhonny Chimpo, 999-00-1111), Offences ( Broke window, slapped boss, kicked team lead in his groin)

Output: Gets pink slip

So the piece of code I want to write evaluates different offences based on rules for each offence and combined offence. The current code is just a maze of if and else statements. I am sure such business problems are common. What design/enterprise pattern is usually used to solve a problem like this?

Is it the specification pattern? I want the code to be open for extension, clean and flexible.

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1 Answer

  1. Editorial Team

    Basically business rules look like

    forall rules:
  if <condition> then doAction();

    What about categorizing all offences by severity using scores, perhaps extra bonus for frequent “evil-doers”, some offences may become time-barred and whatever required.

    Then a rough draft of an algorithm could be:

    • Sum of all scores of a customer (weighted)
    • compare to maximum

    This would be straight forward using data structures instead of many (possibly deeply nested) if..then..else things.

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