I. Establishment of the Basis for Solution of the Problem. II. Determination of Suitable, Feasible, and Acceptable Courses of Action. III. Examination into the Capabilities of the Enemy. IV. Selection of the Best Course of Action. V. The Decision. A tabular form inserted in the Appendix lists the foregoing headings and their principal subdivisions within the Estimate Form. For convenience, the appended Form also includes page references to the discussion in this chapter. SECTION I ESTABLISHMENT OF THE BASIS FOR SOLUTION OF THE PROBLEM As noted in the Fundamental Military Principle, each objective, prior to its selection, and each operation, prior to its adoption, requires examination from the standpoint of suitability, feasibility, and acceptability. Suitability involves the factor of the appropriate effect desired; feasibility involves the factors of the means available and opposed, as influenced by the characteristics of the theater; and acceptability involves the factor of the consequences as to costs. In order to establish a sound basis for the solution of a military problem, one which will permit the tests for suitability, feasibility, and acceptability (see pages 98-102) to be intelligently applied, it is necessary that the factors involved be studied. A. The Appropriate Effect Desired. The appropriate effect desired, the first factor listed, is the goal toward which the commander is working. He is enabled to form an understanding of this essential aspect of his problem through (1) a grasp of the salient features of the situation, (2) a recognition of the incentive to solution, and (3) an appreciation of the assigned objective. He expresses this understanding by (4) formulating the mission. The sequence in which the commander takes up these considerations is a matter for his own choice. Usually, directives from higher authority (see Chapter VIII as to the Order Form) give him, first, information as to the situation; thereafter, such directives assign him a task (or tasks) involving one or more assigned objectives. For this reason, the sequence so indicated is the one utilized here. (1) Summary of the Situation. Before the commander can decide whether he wishes to maintain the existing situation or to change it, he requires a mental picture of its salient features. On beginning the Estimate, the available information is therefore briefly summarized. The picture presented here will show in broad outline (page 79) the opposing forces as disposed in localities which constitute relative positions with reference to each other. Details are reserved for Section I-B of the Estimate. The appropriate data are noted on the chart, and study of the chart goes hand in hand with the development of the Estimate.