ABSTRACT
Why should a book on personality measurement be concerned with constructs and their definitions? Constructs and their interrelationships form the body of a science. Empirical findings or “facts” are important only insofar as they have relevance for constructs and propositions about them. And of course, even an empirical finding that index X is related to index Y already involves concepts of X and Y at a low level of abstraction. There is little point in measuring something or in relating one set of measurements to other data unless the measurements are pertinent in some way to a construct. A basic consideration in planning to measure is the coordination between the measurement procedure and the construct at which the procedure is aimed.
