"I am trying to understand the identity, potentialities, struggles, and dilemmas of OD by exploring a set of values and philosophies which underlie it and have contributed to its development. The interplay of three values-rationalism, pragmatism, and existentialism-is described as a means toward this understanding. All three values are essential ingredients of OD; yet each lends to OD a different and sometimes contradictory identity.
Hainer, R.M.Rationalism, pragmatism, and existentialism: Perceived but undiscovered multicultural problems. In E. Glatt and M.W. Shelly (Eds.), The research society. New York: Gordon & Breach, 1968.