All these considerations involve the proper evaluation of the factors applicable (page 25) to the particular problem. Each objective, prior to its selection, and each operation, prior to its adoption, will require examination of its suitability with regard to the appropriate effect desired; of its feasibility with respect to the action contemplated as to physical objectives, relative positions, the concurrent apportionment of fighting strength, and freedom of action; and, finally, of its acceptability with reference to consequences as to costs. CHAPTER V THE FOUR STEPS IN THE SOLUTION OF A MILITARY PROBLEM Chapter V discusses the four steps in the application of mental effort to the successful attainment of a military objective. Emphasis is placed on such matters as: the Estimate of the Situation in basic problems, together with certain details as to tasks, the mission, courses of action, and the Decision; the formulation of detailed plans, including subsidiary plans; directives; the Running Estimate of the Situation; and the use of Forms in the solution of problems. In Chapter II it has been brought to notice that every problem, regardless of its type and scope, has its source in a perplexity created by an apparent difficulty inherent in a situation. Where there is a sufficient incentive to change or maintain the situation, the problem is one which requires solution. (See page 20.) A situation may be actual or assumed. In broad outline, an actual military situation is always likely to present a picture of opposing organizations of human beings, each possessed of fighting strength and disposed in a locality or localities which constitute relative positions with reference to each other. This picture may be expected to assume various aspects as action progresses (see page 38). The concern of the commander is to control the unfolding of the original situation, to the end that he may attain the effect he desires (page 72). (See also Chapter IX.) The incentive to solve a problem is provided by a realization, on the part of the individual concerned, of a need to make provision for the attainment of an objective. In the ease of a military problem, such incentive may result (1) from a directive issued by higher authority, usually in the form of an assigned task, or (2) from the fact that a decision already reached by the commander has introduced further problems, or (3) from a recognition of the demands of the situation. (See page 44.) An objective is best attained by the successful application of properly directed effort. There is thus an essential and continuing relationship between the incentive to solve a problem, and the task which assigns the objective (or objectives) and thus motivates the procedure necessary for the attainment of the objective(s) so assigned (page 50). Such a task may, therefore, be referred to as the motivating task.