All individuals assisting in the MBTI® Instrument interpretation at KnowYourType meet the American Psychological Association's qualifications for class B instruments. The MBTI® Instrument is a class B instrument.

The tests catalogued on this Web Site have been classified in terms of the professional training required for their use. Standards have been set by the American Psychological Association. The letter placed next to test titles indicates the level of the test, as follows:

(A) Tests marked with the letter "A" and all books, guides or programs are available to any licensee.

(B) To license "B" materials, you must have a degree from an accredited college or university and have satisfactorily completed a course in the interpretation of psychological tests and measurement at an accredited college or university.

(C) To license "C" materials, you must fulfill all qualifications required of "B" users, plus possess an advanced degree in a profession that provides training in the interpretation of psychological tests.

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