Choose a variable that a psychologist might be interested in measuring.
First, provide a conceptual (i.e., in words) definition. Then, describe an observational measure, a physiological measure, and a self-report measure. Be specific and detailed.
Measurements occur throughout the sciences. Often they involve specific quantities, such as the mass or size of an object.
In psychology, however, measurement can become more difficult, because it involves the mind.
A psychologist might be interested in measuring sexual desire.