In one well known personality test there are 16 major types all of which are regarded as normal and useful in research.
I recall a seminar in which the group activity was to answer a question and take a place in line depending on the answer. One question was this. If a piece of work is due in 3 weeks, and normally takes 2 days to complete when would you start the work? I took my place in line with a colleague near the end that preferred to start as soon as possible and finish early. Then I looked down the line and saw associates including my manager and my assistant at the far end of the line.
With several seminars of different types I came to the opinion that organizations waste most of their resources trying to standardize a personality type that is thought to be appropriate for the work, succeeding by high turnover in selecting personality profiles while failing in research objectives.
The seminars changed my approach to management practice of deciding what needed to be assigned, changed, scheduled, and prioritized.
How Many Personality Types Can A Research Group Use Productively?