They explain a person's tendency but they should define who you are.
As stated in the other thread - I know people with advanced degrees in psychology and organizational psychology, one of whom I spoke with last night about this subject.
He happened to do his graduate work on them.
Feeling is - they are good at discerning a person's tendencies and overall disposition but are not hard/rigid boxes that people either fit in or don't. They have value and are useful for his research- consumer products company with global reach.
