Wikipedia:Reasonability Rule

The Reasonability Rule: if an action cannot be considered "reasonable" or "acceptable" by an objective third person, that action should not be performed.

While the term seems to originate in the insurance industry (which applies a form of the reasonable rule by determining, for example, whether it is reasonable for a particular medical procedure to be done on a particular client in order to determine if the medical insurance company will pay for that procedure), it applies in many other arenas, including:

Editors are urged to observe the Reasonability Rule when working in a massive collaborative effort such as the Electronic Encyclopedia:

Another way of looking at the Reasonability Rule is this: if you're involved in an action or judgment involving (or by) another person, reverse roles. If the role reversal forces a change of opinion as to whether the action or judgment is unreasonable, then the original action—with the original roles—violates the Reasonability Rule. Such violations should be kept to a minimum: full compliance with the Reasonability Rule will result in a minimum of conflict and a maximum of production and enjoyment for all who participate. Such is always the goal of a collaboration of any scale.

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Wikipedia