“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.”

— Kurt Lewin

Source: 1930s, Principles of topological psychology, 1936, p. 12-13.

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Kurt Lewin 48

German-American psychologist 1890–1947

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“The life space… includes both the person and his psychological environment. The task of explaining behavior then becomes identical with (1) finding a scientific representation of the life space (LSp) and (2) determining the function (F) which links the behavior to the life space. This function (F) is what one usually calls a law… The novelist who tells the story behind the behavior and development of an individual gives us detailed data about his parents, his siblings, his character, his intelligence, his occupation, his friends, his status. He gives us these data in their specific interrelation, that is, as part of a total situation. Psychology has to fulfill the same task with scientific instead of poetic means…. The method should be analytical in that the different factors which influence behavior have to be specifically distinguished. In science, these data have also to be represented in their particular setting within the specific situation. A totality of coexisting facts which are conceived of as mutually interdependent is called a field. Psychology has to view the life space, including the person and his environment, as one field.”

Kurt Lewin (1890–1947) German-American psychologist

Kurt Lewin (1946) "Behavior and development as a function of the total situation". In K. Lewin (Ed.) Field theory in social science (pp. 238-305). New York: Harper & Row. p. 240 as cited in: John F. Kihlstrom (2013) " The Person-Situation Interaction" http://ist-socrates.berkeley.edu/~kihlstrm/PxSInteraction.htm
1940s

“Having analyzed these traits, we can now advance a definition of propaganda — not an exhaustive definition, unique and exclusive of all others, but at least a partial one: Propaganda is a set of methods employed by an organized group that wants to bring about the active or passive participation in its actions of a mass of individuals, psychologically unified through psychological manipulations and incorporated in an organization.”

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“It is important, therefore, to understand at the outset the simplicity of this book - what it can accomplish and what it cannot. What it does try to do is to isolate certain psychological factors and to demonstrate rigorously by quantitative scientific methods that these factors are generally important in economic development.”

David C. McClelland (1917–1998) American psychological theorist

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“The theorists of scientific management seem to think that the most subtle methods are indispensable for physical measurements, but for psychological inquiry nothing but a kind of intuition is necessary.”

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“Propaganda is a set of methods employed by an organized group that wants to bring about the active or passive participation in its actions of a mass of individuals, psychologically unified through psychological manipulations and incorporated in an organization.”

Jacques Ellul book Propaganda: The Formation of Men's Attitudes

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Context: Having analyzed these traits, we can now advance a definition of propaganda — not an exhaustive definition, unique and exclusive of all others, but at least a partial one: Propaganda is a set of methods employed by an organized group that wants to bring about the active or passive participation in its actions of a mass of individuals, psychologically unified through psychological manipulations and incorporated in an organization.

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Lancelot Law Whyte (1896–1972) Scottish industrial engineer

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“The method of viewing things which proceeds in accordance with the principle of sufficient reason is the rational method, and it alone is valid and of use in practical life and in science. The method which looks away from the content of this principle is the method of genius, which is only valid and of use in art.”

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“Hypnotism is undoubtedly the most important, the most fruitful and far-reaching method of experimental psychology.”

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“Statistics are the triumph of the quantitative method, and the quantitative method is the victory of sterility and death.”

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