The T-F scale tends to have the lowest reliability of the four scales. The reliabilities are quite good across age and ethnic groups, although reliabilities on some scales with some groups may be somewhat lower. When people change their type on retest, it is usually on one scale, and in scales where the preference clarity was low. On retest, people come out with three to four type preferences the same 75-90% of the time. Reliabilities (when scores are treated as continuous scores, as in most other psychological instruments) are as good or better than other personality instruments. Some conclusions about the reliability of the MBTI® instrument that would be helpful to know. It is of interest to (MBTI®) practitioners because it tells us that there is more "noise" when using the MBTI® instrument with some groups of respondents - and this is important to know." This is of special interest to people who construct instruments because the more consistency there is, the less "noise" there is in the measurement process.
This is, not surprisingly, called internal consistency reliability. There is also a kind of reliability that addresses the degree to which someone answers questions consistently on any given scale on the same taking of the MBTI® instrument. It should be understood that the MBTI® instrument meets and exceeds the standards for psychological instruments in terms of its reliability. But there are generally accepted standards for psychological instruments. With the MBTI® instrument, as with other psychological instruments, you want the person to come out the same type both times they take it (this is test-retest reliability, the kind most people care about).īecause personality is "slippery" to measure, psychological instruments cannot have the same consistency you would expect from, say, a ruler. Why is consistency important? Well, when you measure something with an instrument two times, you want it to come out with the same answer (or close to it) both times. What is reliability? Reliability is how consistently a test measures what it attempts to measure. The following excerpts are adapted from Chapter 7 of Building People,īuilding Programs, written by Drs.
The Reliability and Validity of the Myers-Briggs Type Indicator Instrument
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