“There is nothing so practical as a good theory” Kurt Lewin (Lewin, 1951, p. 169).
Kuhn, M. H. (1951). LEWIN, KURT. Field Theory of Social Science: Selected Theoretical Papers. (Edited by Dorwin Cartwright.) Pp. xx, 346. New York: Harper & Brothers, 1951. The ANNALS of the American Academy of Political and Social Science, 276(1), 146–147. https://doi.org/10.1177/000271625127600135