Thematic Apperception Test (TAT) of measuring personality is a

Personality is all that a person is. It is the totality of one's behaviour towards one's own self as well as others. It includes everything about the person, his/her physical, emotional, social, mental, and spiritual make-up

Key Points 

Projective techniques of personality measurement are the tests that are designed:

• to reveal those central aspects of personality that lie in the unconscious mind of an individual.
• to evaluate a person's interests, attitudes pattern of thought, etc while giving responses to ambiguous test materials.

Important Points

There are different kinds of projective techniques of personality measurement and Thematic Apperception Test is one of them.

Henry Murray, an American psychologist developed the Thematic Appreciation Test.

• A thematic apperception test (TAT) is a projective technique used to investigate a person's unconscious self.
• More specifically, a thematic apperception test can uncover a person's true personality, their capacity for emotional control,
  and their attitudes towards aspects they encounter in everyday life (wealth, power. gender roles, racial and religious attitudes, intimacy, etc.).

Thus, it is concluded that Thematic Apperception Test (TAT) of measuring personality is a projective technique.

Additional Information

• Subjective technique involves subjective judgments but is not the primary focus of TAT, which aims to project unconscious elements of personality.
• Objective technique involves structured tests with specific questions and clear scoring methods, such as multiple-choice or true/false tests, which is not the case with TAT.
• Experimental technique involves controlled experiments to test hypotheses, which is not how TAT is typically used.