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guideline
This term carries a soft authority. It suggests a recommended path rather than a rigid mandate. While a law or a rule is a hard boundary that triggers a penalty if crossed, a guideline serves as a helpful map or a framework to ensure consistency and quality. In professional environments, using this word allows for flexibility and professional judgment. It implies that while there is a standard way of doing things, there may be legitimate exceptions depending on the specific context of the situation.
Countable when referring to a specific individual rule in a manual (the third guideline is unclear). Uncountable when referring to the general concept of guidance (the project lacks clear guideline).