Best practice

A best practice is a method or technique that has been generally accepted as superior to any alternatives because it produces results that are superior to those achieved by other means or because it has become a standard way of doing things, e.g., a standard way of complying with legal or ethical requirements. 
Best practices are used to maintain quality as an alternative to mandatory legislated standards and can be based on self-assessment or benchmarking.[1] Best practice is a feature of accredited management standards such as ISO 9000 and ISO 14001.[Wiki18]
Best practice may be science-based or not. See: Science-based practice; Evidence-based practice. 
* See similar: 20% rule. Which is operative at Google. Simply put, employees get 1/5th of their time to work on projects of their own choosing.