The MBTI detects categories of preferences rather than measuring how much of a trait one exhibits. The type pattern exists as a whole, and the MBTI code points to the pattern rather than a combination of independent preferences. However, in actual use of the MBTI, these preferences have often been described by many as if they are measurable traits and as if they can be combined to produce a “type.” Now, after over twenty-five years of use, most expert MBTI users are realizing the unintended consequences of using the instrument in that way.n looking at how temperament relates to the MBTI, it is important to remember that the results of any instrument are just an artificial snapshot in time. Also, an instrument is not the theory. The results of an instrument are neither the whole of a theory nor the whole of a personality. This is why ethical and competent users of the MBTI follow the face-to-face feedback standards of self-selection and validation by the client. One must not assume the results of the MBTI (or any other instrument) are one-hundred percent accurate. They must always be validated through an exploratory process such as we describe for temperament in this book.Relationship of Temperament to Jung's Types and to the MBTIThe MBTI instrument was designed to “indicate,” not measure, and is best used as a data point to guide you in a direction. It is not meant to be used as a “test-and-tell” method of discovering your best-fit type pattern. A process of self-discovery is always recommended to clarify your best-fit type pattern.
Add some of your own clarifications if you'd like, people seem to be missing these points a lot.