SOP
Standard Operating Procedure
An SOP is the written, step-by-step description of how a recurring task is carried out in a business. It lets another person, or an automation, produce the same result without depending on whoever usually did it. It is the basic unit of a business that can be delegated.
A useful SOP is written while performing the task, not afterwards from memory, and includes what typically goes wrong and how ambiguous cases are decided. The test is simple: if an outsider follows it and gets the same result without asking anything, it is well written.
Also called: operating procedure, process documentation, playbook