Formulation of the New Mission. An appropriate new task having been determined, as well as a proper purpose, the commander is now in a position to formulate his mission. The procedure to this end is the same as described (Chapter VI) with respect to the estimate of a basic problem. Other Items of the Estimate. For such problems of the fourth step, other items of the Estimate Form require no essential modification of the procedures described (Chapter VI) as applicable for the first step. The Further Procedure Applicable to Such Problems of The Fourth Step After the commander has reached his new decision, the further course of events may call for the resolution of the required new action into detailed operations and for the inauguration of a new planned effort. In such case, these procedures are accomplished through processes essentially similar to, and fortified by the experience gained in, those distinctive of the second and third steps. (Chapters VII and VIII, respectively). The new planned effort having been inaugurated, its supervision continues, in turn, through the critical observation and the appropriate action described herein as distinctive of the fourth step. The Running Estimate of the Situation The procedure employed in the constant, close observation of the unfolding of the situation--to the end that justified changes of plan may be initiated, while those uncalled-for may be avoided--is known as the "Running Estimate of the Situation". Such an estimate, as indicated by its name, is intended to keep pace with the flow of events, so that the commander may be assured, at any time, that his concurrent action will be based on sound decision. To this end, there is a definite technique for which the standard Estimate Form provides the basis. This technique is an aid for solution of the problem involved in the supervision of the planned action. Aim of the Technique Involved. Any procedure adopted to this end is properly intended to assist in the supervision of the planned action, but not to restrict the commander to particular methods. Flexibility is a prime consideration. The ultimate aim of the technique is (see also page 114) the rapid and successful exercise of mental effort in the fast-moving events of the tactical engagement. It is under such conditions, more especially, that effective supervision of the planned action becomes a problem calling for every facility that can be afforded the commander.