arnold on Sep 16, 2008
Measurement applies to the properties of an object. Measurement of the psycholoical attribute occurs when a qualitative value is assigned to the behavioral sample collected by using a test. From a measurement of observable behavior, the test devloper draws an inference about the amount of the theoretical construct that characterizes an individual.
Why measure constructs?
Because a construct provides an efficient and convenient method for labeling a number of similar behaviors.
Anything to add?
Information from (CA, 1986, p. 5).