Is the MBTI® Instrument reliable? Has it been statistically validated? A.
People scored the same on a subsequent administration of the MBTI® Instrument about 75 percent of the time. Only about 1 in 1,000 persons will change on all four scales. When change does occur, it is more likely on those scales where the original preferences score was slight. Additional factors affecting test-retest reliability relate to participants’ age, reading level, and achievement as measured on intelligence tests. Older persons, those with higher reading levels and those with higher IQs, tend to be more consistent from one MBTI® Instrument administration to another.Q. Can I retake the MBTI® Instrument and see if my results change? A.We generally do not encourage people to retake the MBTI® Instrument but rather work with the concepts to determine what is most accurate for them.
