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The Myers-Briggs Type Indicator® (MBTI®) assessment is one of the world's most popular personality tools?because it works. Used by more than 88 percent of Fortune 500 companies in 115 countries, and available in 29 languages, it has become the go-to framework for people development globally.

The determination of validity usually requires independent, external criteria of whatever the test is designed to measure. An objective of research in personality measurement is to delineate the conditions under which the methods do or do not make trustworthy descriptive and predictive contributions.

There are several tests/inventories which are available for the assessment of personality. Broadly, these can be grasped into one of the three categories. These are the subjective, objective and projective methods.

The two most common validation methods are construct validity and criterion validity. Construct validity proves that a test measures a construct rather than a skill or ability. Intelligence, motivation and anxiety are all examples of constructs, they exist in the brain, but we cannot directly observe them.

Test Reliability and Validity Inconsistencies may result from people changing their mood, not being quite sure about themselves, or just being distracted, for example. Psychometricians can assess a test's reliability by asking many people to take it twice over a short period.

These tests, which include the Myers-Briggs Type Indicator (MBTI), the Sixteen Personality Factor Questionnaire (16PF) and others, are available online, for prices upwards of ? 2,500.

It is a questionnaire completed by prospective employees to help recruiters identify relevant and useful personality traits. The questionnaire measures various aspects of a candidate's character and abilities, such as their communication, social skills and the way they handle stress.