Only by the concrete whole which comprises the object and the situation are the vectors which determine the dynamics of the event defined. - Kurt Zadek Lewin

[Life space was defined as] the totality of facts which determine the behavior (B) of an individual (or group/organization) at a certain moment. The life space (L) represents the totality of possible events. The life space includes the person (P) and the environment (E). B = f(L) = f(P.E)

The scope of time ahead which influences present behavior, and is therefore to be regarded as part of the present life-space, increases during development. This change in time perspective is one of the most fundamental facts of development. Adolescence seems to be a period of particularly deep change in respect to time perspective. The change can be partly described as a shift in scope. Instead of days, weeks, or months, now years ahead are considered in certain goals. Even more important is the way in which these future events influence present behavior. The ideas of a child of six or eight in regard to his occupation as an adult are not likely to be based on sufficient knowledge of the factors which might help or interfere with the realization of these ideas. They might be based on relatively narrow but definite expectations or might have a dream or playlike character. In other words, "ideal goals" and "real goals" for the distant future are not much distinguished, and this future has more the fluid character of the level of irreality. In adolescence a definite differentiation in regard to the time perspective is likely to occur. Within those parts of the life-space which represent the future, levels of reality and irreality are gradually being differentiated.

The choice between two pleasant things is generally easier than that between two unpleasant unless questions are involved which cut deeply into the life of the individual. Such a conflict situation can upon occasion also lead to an oscillation between two attractions. It is of considerable importance that in these cases a decision between two attractions. It is of considerable importance that in these cases a decision or one goal alters its valence in such a way as to make it weaker than that of the renounced goal.