A rule of thumb is a type of heuristic that can help you perform desirable behaviors more consistently. Applying rules of thumb can also eliminate some mundane decisions, thereby conserving willpower.
Decision Making Short-Cuts
“Eat a fruit and a vegetable at every meal.”
“Pay yourself first.”
“Fill your gas tank when it reaches 1/2 full.”
These are “rules of thumb” – common sense guidelines that provide guidance in daily situations. They are short-cuts to decision making.
The phrase rule of thumb refers to “a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It refers to an easily learned and easily applied procedure or standard, based on practical experience rather than theory.” [Wikipedia]
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