The choice between two pleasant things is generally easier than that between two unpleasant unless questions are involved which cut deeply into the l… - Kurt Zadek Lewin

At the present we have no adequate scientific method for representing the psychological life span. In accord with the general methods of psychology, the study of environmental influences began with classification and statistics... they gave us excellent descriptions of the home environment. The method of representation is partly akin to that of the novelist i.e., one trying to make as lifelike picture of the situation as possible by choosing expressive words and bringing out significant traits with examples. In general, the descriptions that have been made valuable to science have not been those made by scientific methods. Where theoretical concepts have been introduced with the concrete description, they often stand out as something alien. In stead of scientific descriptions they are nothing more than speculative interpretation.

One can ask two different kinds of questions with regard to the topics of study in psychology as well as in other sciences. One can ask for the phenomenal characteristics of psychological units or events, for example, how many kinds of feelings can be qualitatively differentiated from one another or which characteristics describe an experience of a voluntary act. Aside from this are the questions asking for the why, for the cause and the effect, for the conditional-genetic interrelations. For example, one can ask: Under which conditions has been a decision made and which are the specific psychological effects which follow this decision? The depiction of phenomenal characteristics is usually characterized as “description”, the depiction of causal relationships as “explanation.”

For any type of social management, It is of great practical importance that levels of quasi-stationary equilibria can be changed in either of two ways: by adding forces in the desired direction, or by diminishing opposing forces.