In any determinate end there is inevitably implied a number of groups of factual judgments in which are presented the objective conditions under which execution of the end or purpose must take place. There is in the first place a general view of environing conditions, physical and social, presented in a group of judgments (1) descriptive of the means at hand, of the topography of the region in which the purpose is to be carried out, of climatic conditions, and the like, and (2) descriptive of the habits of thought and feeling of the people with whom one is to deal, their prejudices, their tastes, and their institutions. The project decided on may, let us say, be an individual or a national enterprise, whether philanthropic or commercial, which is to be launched in a distant country peopled by partly civilized races. In addition to these groups of judgments upon the physical and sociological conditions under which the work must proceed, there will also be a more or less adequate and impartial knowledge of one's own physical and mental fitness for the enterprise, since the work as projected may promise to tax one's physical powers severely and to require, for its successful conduct, large measure of industry, devotion, patience, and wisdom. Indeed any determinate purpose whatever inevitably implies a more or less varied and comprehensive inventory of conditions. Further illustration is not necessary for our present purpose. We may say that in a general way the conditions relevant to a practical purpose will group themselves naturally under four heads of classification, as physical, sociological, physiological, and psychological. All four classes are objective, though the last two embrace conditions peculiar to the agent as an individual over against the environment to which for purposes of his present activity he stands in a sense opposed.