The phrase "set guidelines" can be expressed in a variety of ways depending on the context and the intended meaning. Some synonyms for this phrase include "establish parameters," "define standards," "lay down rules," "create protocols," "formulate policies," "set benchmarks," "outline criteria," and "prescribe procedures." Each of these synonyms emphasizes a different aspect of the act of setting guidelines, and may be more appropriate in certain situations. For example, "establish parameters" may be a good choice when defining the boundaries of a project, while "formulate policies" may be more appropriate when creating rules for an organization. Overall, choosing the right synonym for "set guidelines" is important for clear and effective communication.