While authoritative, Doc 9811 is not without limitations:

The confusion between Doc 9811 and training manuals is understandable, as ICAO’s framework for aviation personnel training has undergone significant evolution. The shift from a traditional, hour-based training model to a modern, approach represents a major change in how air traffic controllers are trained and evaluated.

While the content is confidential, the manual generally addresses:

Because this text dictates infrastructure design, it is a foundational reading requirement for several specific industry roles: