gah, I probably should have posted this in an mbti forum rather than here. MBTI is an acronym for Meyer-briggs type indicator. She based this off of the ideas of Carl Jung. There are 4 characeteristics that it measures people by which are Introversion Vs. Extroversion, Sensing Vs. Intuition, Thinking Vs. Feeling, and Judging vs. perceiving. The four letter combination that is assigned to a person will also get at something more interesing, cognitive processes. The second and third letters correspond with the actual functions. These functions can be introverted or extroverted. So abbreviated, they are Si, Se, Ni, Ne, Fi, Fe, Ti, and Te. So, an INTJ would have Some kind of intuition and Thinking function. The last letter, J will tell us which. Js extrovert their judging process and introvert their data collecting process, (for Ps it is vice-versa) so our INTJ example would use Ni and Te. The first letter tells you which is dominant. In an ENTJ order of Dominance would be Te, Ni, but this is opposite for the INTJ.
fun fact: ironically most aspies belong to the temperament NT under MBTI
a few links:
http://www.typelogic.com/intj.html (descriptions of each type)
http://www.cognitiveprocesses.com/asses ... p_old.html (is a test but will help you to understand the functions)
http://personalitycafe.com/forum/ (if you don't get my explanation you can visit this forum, and someone there will help you)