Standards are varied in character, subject and medium. The content of a standard will vary according to the level of detail required for specificity. It may specify the tasks that a certain range of equipment must be able to perform, or describe in detail an apparatus and it safety features.

It may contain diagrams, symbols, codes, test methods as well as definitions. It may describe systems, characteristics or methods of preparing documents.

It may also address issues such as the qualification of technical staff, quality control and specifications.