"Plumb rules" refers to the set of standards or principles that govern a particular field or situation. Synonyms for this term may include benchmarks, guidelines, protocols, codes, parameters, criteria, and yardsticks. These words all denote a set of criteria for measuring or assessing something against a common standard. They are used to ensure that individuals or organizations adhere to the established standards and are held accountable for their actions. Whether it's in the medical field, engineering, education, or any other profession, having a clear set of plumb rules is essential for ensuring consistency, quality, and the achievement of desired outcomes. Synonyms such as benchmarks and yardsticks help people clearly see how they are doing and where they need to improve.