This inventory, by Myers and Briggs (1962, 1976,1977), was designed to measure personality preferences or types and was not designed as scale for measurement of traits or behaviour.

This psychometric questionnaire measures psychological preferences in how people perceive the world and make decisions.

The Inventory has 50 items, each of which is a forced choice between two options. All choices reflect the two poles of the same Jungian preferences namely:

• introversion / extroversion,
• sensation / intuition,
• thinking / feeling,
• judging / perceiving aspect of the personal preferences