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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