From a governance perspective, it is important to understand the difference between a policy, procedure, standard, and guideline. Note the following diagram:

• Policy: A policy is always the apex among the other documents. A policy is a high-level statement that reflects the intent and direction from the top management. Once published, it is mandatory for everyone within the organization to abide by the policy. Examples of a policy are internet usage policy, email policy, and so on.

• Standard: A standard is nothing but an acceptable level of quality. A standard can be used as a reference document for implementing a policy. An example of a standard is ISO27001.
• Procedure: A procedure is a series of detailed steps to be followed for accomplishing a particular task. It is often implemented or referred to in the form of a standard operating procedure (SOP). An example of a procedure is a user access control procedure.
• Guideline: A guideline contains additional recommendations or suggestions that are not mandatory to follow. They are best practices that may or may not be followed depending on the context of the situation. An example of a guideline is the Windows security hardening guideline.