The problem will require solution only when accompanied by an incentive which demands a changed situation or resistance against a threatened change. A recognition of the incentive thus necessarily involves realization of a desire or need to maintain the existing situation or to change it into a new one. Such realization may come on the initiative of the person confronted with the situation, or because he has received instructions from someone in authority. In either case, the effect so indicated is the outcome of a desire for change or for resisting change, and may therefore be regarded properly as an effect desired (page 19). As so far outlined, therefore, the establishment of the correct basis for the solution of the problem involves (1) a grasp of the salient features of the situation, (2) a recognition of the incentive, and (3) an appreciation of the effect desired. The "appropriate" effect desired will necessarily be suitable to the further effects (page 19) which are inherent in the situation. An effect to be attained is accepted as appropriate when, after due examination, its relationship with the further effects involved, in all their pertinent implications, has been found to be in accordance with the dictates of sound judgment. The establishment of the basis for the solution of the problem will also require an understanding of the resources involved, as influenced by the conditions obtaining, for the maintenance of the existing situation or for the creation of a new one. The resources available, as influenced by the conditions obtaining, are correctly considered on a relative basis as compared to those of any persons who may oppose the effort. With the basis for the solution of the problem established in this manner, the actual solution involves the consideration of one or more plans, i.e., proposed methods of procedure, and the selection of the one considered to be the best. The person concerned, taking cognizance of the present condition, i.e., the existing situation, first considers whether this situation, if maintained, will be suitable to the appropriate effect desired. Then, unless satisfied that he desires no change, he creates one or more images of future conditions, i.e., mental pictures of new situations, which will also be suitable to this end. The maintenance of the existing situation, or the creation of a new one, will in each case involve a plan. Necessarily, each such plan includes provision for (1) an effect to be produced by the person solving the problem, which effect will be the maintenance of the existing situation or the creation of a new one as visualized by himself, and (2) the action required to produce this effect and so to attain the appropriate effect desired, already established as an essential part of the basis of his problem. After systematic examination of such plans, those retained for further consideration can be subjected to a comparison as to their relative merits.