“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.””

—  Kurt Lewin

Kurt Lewin (1927). "Gesetz und experiment in der Psychologie" [Law and experiment in psychology]. in: Symposion, Vol 1, p. 375-421. Translated by and cited in: Kurt Kreppner " On the Generation of Data in the Study of Social Interaction1 http://www.scielo.br/pdf/ptp/v17n2/7871.pdf" in: Psicologia: Teoria e Pesquisa Vol 17, nr. 2, p. 109.
1920s

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Kurt Lewin 48
German-American psychologist 1890–1947

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