9-115. After determining the broad concept, planners create a task organization by assigning headquarters to groupings of forces. They consider the types of units to be assigned to a headquarters and the ability of that headquarters to control those units. Generally, a headquarters controls at least two subordinate maneuver units (but not more than five) for fast-paced offensive or defensive tasks. The number and type of units assigned to a headquarters for stability tasks vary based on factors of the mission variables: mission, enemy, terrain and weather, troops and support available, time available, and civil considerations (METT-TC). If planners need additional headquarters, they note the shortage and resolve it later. Task organization takes into account the entire operational organization. It also accounts for the special command requirements for operations, such as a passage of lines, or air assault.