The value of the entries in the parallel columns at this point of the estimate will depend upon the skill of the commander in judging the factual data contained in all of the known factors of strength and weakness. The proper entries to be made will depend upon circumstances. In one estimate, for example, the anti-aircraft armament available to a carrier group will be of vital importance. In another estimate of the same carrier group, anti-aircraft defense will be of no importance because no enemy aircraft can be employed in the situation being estimated. Again, in a local tactical situation, if the ships involved have just been fueled, the economical steaming radius may be of no immediate importance. And while the total amount of high-test gasoline which can be produced in a State in the coming year may be vital to a broad strategical estimate involving war against trade, that information may be of little use in a tactical estimate of a localized, fleeting situation. Thus, in determining what factors to evaluate, and in assessing their relative value, the commander considers only such as can possibly affect the effort to be made in the theater under consideration. The summary of strength and weakness factors is, then, a summary of those factors which the commander considers will affect the character of his effort. This summary indicates the relative importance of such factors. A mere list of facts will not serve the purpose. What is needed here is a series of evaluations and conclusions which may result from a study of the pertinent details. With the circumstances attending his particular problem clearly in mind, the commander carefully reviews each of the factors of fighting strength in the theater; he classes each as either a strength or weakness factor for himself or his opponent, and enters it in the proper column. A strength factor for one is not necessarily entered as a weakness factor for the opponent:--what is required is a well-digested summary of the factors which give to either side an advantage or a disadvantage as compared to the other. NOTE The Estimate procedure has, to this point, established the basis for the solution of the problem through evaluation of the factors pertaining to the requirements of suitability, of feasibility, and of acceptability of the consequences as to costs. On this basis, the commander is ready to consider such courses of action as may be pertinent. To this end, he has a choice of procedures. He may first consider courses of action for himself. He may prefer, however, to consider first those which are applicable to the enemy. If the commander considers his own courses of action first, this procedure has an advantage in that it narrows, later, the scope of enemy courses which are pertinent to his situation. This is true because consideration of enemy courses may in such a case be restricted to those which give promise of countering, effectively, his own courses of action.