Put behavior where the data lives
Assign a method to the class that has the information needed to perform it.
The move: ask who knows enough to do the work. GRASP Information Expert is a responsibility-assignment rule: put a behavior on the class that has the information needed to fulfill it. This keeps logic close to the state it relies on and stops your design from becoming a pile of records plus one giant service. Signal 1: parameter drag If a method receives an object only to pull out several fields, that object may be the better owner of the behavior. Signal 2: duplicated rule checks If two services repeat the same if invoice overdue and customer is not exempt…
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