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  1. Whenever the result depends on multiple input values, it is best to use a decision table.
  2. Whenever the result is a calculation, it is probably best to use a form with a business rule.
  3. When using justifications (and you will most likely use them, since they are a best practice), the default value expression has limits; only one justification can be used, regardless of the outcome.
  4. It is recommended to formally decide which method to use and capture that in an architecture document. A consistent use of a style throughout a project will help the maintainability of a project. There are many roads that lead to Rome, but within one project it is best if all business engineers follow the same road.

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