You can study independently using the PADI Divemaster Manual and Video or through Divemaster eLearning. Depending on where you do your Divemaster course, some knowledge development may consist of independent study, instructor led presentations and discussions or a combination of both. All the knowledge development for the Divemaster course is available on an eLearning platform as well.
You will also need to prepare an emergency assistance plan which includes all relevant information to manage a scuba diving accident.