[Answer] What are the three basic categories of controls?

Answer: a. Educational controls. These controls are based on the knowledge and skills of the units and individuals. Effective control is implemented through individual and collective training that ensures performance to standard.b. Physical controls. These controls may take the form of barriers and guards or signs to warn individuals and units that a hazard exists. Additionally special controller or oversight personnel responsible for locating specific hazards fall into this category.c. Avoidance. These controls are applied when leaders take positive action to prevent contact with an identified hazard.