Some Notes on Operationism and the Concept of Validity

C. S. Peirce: Collected Papers, Vol. 5, § 412.

George Lundberg : Foundations of Sociology, pp. 58-65. New York 1939 .

Torsten Husén : Om innebörden av psykologiska mätningar, p. 21. Lund 1949.

Gösta Ekman : Differentiell Psykologi, p. 60. Stockholm 1952.

Torsten Husén : Testresultatens Prognosvärde, p. 20.

Torsten Husén : Testresultatens Prognosvärde, p. 81. Lund 1949.

Rudolf Carnap : Testability and Meaning, Philosophy of Science 1936, 1937. 8. Quoted from Ekman, op. cit., p. 54.

Ekman, op. cit., p. 55.

Gösta Ekman : Intelligensmatning, p. 95. Uppsala 1947 .

S. Stouffer et al.: Measurement and Prediction, pp. 57-59, Princeton 1950.

Arthur Pap : Reduction Sentences and Open Concepts, Methodos 1954; W.V.O. Quine : Two Dogmas of Empiricism, Ch. 2: From a Logical Point of view. Cambridge Mass. 1953.

Arthur Pap , op. cit, p. 10 ff.

Helen Peak : Problems of Objective Observation, Ch. 6: Leon Festinger & David Katz: Research Methods in the Behavioral Sciences. New York 1953.

Karl Popper : Die Logik der Forschung. Vienna 1934 .

W.V.O. Quine : Two Dogmas of Empiricism, p.