Administration is probably the part of MBTI that I'm struggling with the most. I know that, given time and experience, I will get better at it. But for now, I find myself stumbling over setting the stage.
The goal of the the instrument is to measure the client's preferences. Well and good. The goal of the administrator is to present the sorter in an ethical manner and minimize bias or other controllable influences that may affect the reliability of the instrument.
"Answer the questions with your shoes off." This is a common phrase used by MBTI practitioners. What does it mean? It's not immediately clear. I find myself adding to the phrase--answer how you would if you didn't have to work for anyone. Does that work? Not sure. I'm especially concerned about the presentation of the instrument with clients who are working adults. Once in the working world, one quickly realizes that plans and structure are needed and so on.
I know from personal experience that if I respond with my work shoes on, my learned skills in Extraverted Thinking emerge. As an administrator, I'd ask if I am replying as who I am or what I do. This is a big difference--skills in non-preferred function areas can increase, but this does not equate to a Type change.
The administrator is not permitted to explain words or phrases. Any explanation could skew the results. If the client cannot select between the choices offered, s/he should skip the question. Guessing can also affect the reliability.
The client's being under stress/duress can affect reliability. Do the scores on the test relate to hirability? If yes, then 1) the instrument is being used unethically and 2) reliability will suffer. Is the client "in the grip" of a fourth process from some kind of personal life stress? This can also affect reliability and, again, administering the instrument during times of great stress is a questionable ethical practice.
Okay, enough for now.