9-108. The initial array identifies the total number of units needed and identifies possible methods of dealing with the enemy and stability tasks. If the number arrayed is less than the number available, planners place additional units in a pool for use when they develop the initial concept of the operation. (See paragraph 9-106.) If the number of units arrayed exceeds the number available and the difference cannot be compensated for with intangible factors, the staff determines whether the COA is feasible. Ways to make up the shortfall include requesting additional resources, accepting risk in that portion of the area of operations, or executing tasks required for the COA sequentially rather than simultaneously. Commanders should also consider requirements to minimize and relieve civilian suffering. Establishing civil security and providing essential services such as medical care, water, food, and shelter are implied tasks for commanders during any combat operation. (See FM 3-07 for a full discussion on stability tasks.)