Whether written or mental, the complete plan will cover the scope of the Decision, and will be the commander's method of procedure for his future conduct of operations. A commander may, or may not, formulate his complete plan in writing, or embody it in a formal directive which will provide for the execution, in full, of the Decision of his estimate. He may find that his plan divides into several parts, and he may make separate provision for the execution of each of these parts. While the integrity of a plan depends upon the soundness of its essential details, the plan is properly formulated as a directive or directives projected in detail, only so far into the future as the commander's estimate of the situation assures him of reasonable freedom of action (see page 57). Where the commander divides his plan into parts for separate accomplishment, he will naturally exercise care that each part is, in itself, the suitable basis for a complete and homogeneous plan. Successful execution of all these plans results in the complete accomplishment of his Decision. Directives required to further the success of a particular operation may be issued without awaiting formulation of the entire plan. Parts of the plan may be transmitted as fragmentary directives to guide the action of subordinates in instantaneous or early execution. Such cases are far more frequent than are those in which a formal written plan, to guide either the operations in their entirety or a part thereof, is prepared and distributed as a directive. Effective action by the subordinate is thus not delayed by the absence of complete written directives. The commander, more especially during war, may be the only individual who is conversant with the entire plan. He may consider that the necessity for secrecy is paramount, or that there are features to whose details he is unwilling to commit himself until the situation is clearer. However, he may usually expect to disclose its scope and general features to his immediate superior, and the plan in its entirety to his next junior; or, in the interests of mutual understanding, to all his subordinates of the next lower echelon or even to his entire command. The scope of the plan also may be a determining factor. If the plan covers an entire campaign or an extended series of operations, its dissemination is less likely and less general than if it is concerned with only a minor operation. During peace, in exercises simulating war, the complete plan is frequently given circulation for purposes of training. Subsidiary Plans. Subsidiary plans, discussed in Chapter VII (page 168), are frequently issued as annexes to the Operation Plan (page 196) which carries into effect the basic Decision. The commander will be the judge as to whether alternative subsidiary plans are necessary or desirable under the circumstances. Essentials of Military Directives.