The correct physical objectives having been determined, so far as can be done at this time, the commander studies each thoroughly, developing the possibilities of certain effective actions (operations) with reference thereto. For instance, in the case of a commander who has been ordered to "interrupt enemy trade on the southern maritime routes", he might develop one operation "to bomb enemy facilities at Port X", and another "to capture or destroy enemy shipping along trade routes" (with an indication of the routes involved). The operations thus developed are now listed in a definite sequence, in order to provide a proper basis for the further procedure. The commander may find it desirable to state them in their order of importance. Sometimes, however, it may be found advantageous to list the operations in chronological sequence, i.e., in the order of their execution. This point is further discussed hereafter (pages 166 and 192). The commander is at liberty, of course, to use either method according to its helpfulness in enabling him to visualize the elements of his problem. * * * * * The commander now considers the second feature: advantageous relative positions. He may already occupy an advantageous geographical location or locations (see pages 64 (bottom) and 65 (top)), or he may desire to improve his positions in certain respects. An advantageous position might be between the enemy and his base, in order to deny it to him. Another advantageous position might be to windward of the enemy, for the purpose of making a destroyer attack under the protection of a smoke screen. The commander now reconsiders, from the viewpoint of "advantageous relative positions", the operations deduced with respect to "correct physical objectives". As a result of this reconsideration, he may find that certain of these operations may be retained without change, whereas others may require modification. Suppose, for example, that two of the operations listed are those noted above, viz: "To bomb enemy facilities at Port X", and "To capture or destroy enemy shipping along trade routes between the ---- parallels of north latitude and the ---- meridians of west longitude." From the viewpoint of relative position, it may appear that the first operation is not affected seriously, if at all. Therefore, this operation may be left unchanged. However, the second operation may be definitely affected by relative position, because the best method of interrupting enemy trade may be to employ raiding forces in focal areas. Therefore this operation might be altered to the form, "to capture or destroy enemy trade by raiding focal areas" (with a designation of the areas).