Generalizing over conditions by combining the multitrait-multimethod matrix and the representative design of experiments.

Analytical methods should be substituted for the current largely intuitive methods for generalizing results over conditions. Toward that end we present a methodology that combines Campbell and Fiske's (1959) multitrait multimethod matrix and Brunswik's (1956) representative design of experiments. A description of a study of expert judgement and a critique of current practices illustrate the methodology.