Now the world in which we live presents to the child influences comparable with those artificially prepared in this experiment, and the first task of behavior studies is to measure these influences as shown in their effect on personality development. There are in society organized sources of influence, institutions, and social agencies, including the family, the school, the community, the reformatory, the penitentiary, the newspaper, the moving picture. These are sources of mass influence and will naturally be the main objects of study and change. But in order to supplement and make scientific these studies and to give them an adequate method it is necessary to prepare at the same time more complete records of the personal evolution of individuals. Eventually the life of the individual is the measure of the totality of social influence, and the institution should be studied in the light of the personality development of the individual. And as we accumulate records of personal evolution, with indications of the means by which the wishes seek expression and of the conditions of their normal satisfaction, we shall be in a better position to measure the influence of particular institutions in the formation of character and life-organization and to determine lines of change in the institutions themselves. The “human document”, prepared by the subject, on the basis of the memory is one means of measuring social influence. It is capable of presenting life as a connected whole and of showing the interplay of influences, the action of values on attitudes. It can reveal the predominant wishes in different temperaments, the incidents constituting turning points in life, the processes of sublimation or transfer of interest from one field to another, the effect of other personalities in defining situations and the influence of social organizations like the family, the school, the acquaintance group, in forming the different patterns of life-organization. By comparing the histories of personalities as determined by social influences and expressed in various schemes of life we can establish a measure of the given influences. The varieties of human experience will be innumerable in their concrete details, but by the multiplication and analysis of life records we may expect to determine typical lines of the genesis of character as related to types of influence. It will be found that when certain attitudes are present the presentation of certain values may be relied upon to produce certain results.