You guys are aware that Briggs-Meyers is a joke as it rarely gives 2 similar results with a wait period of as little as 6 months, correct? The woman who initially made the test wasn't a psychologist, nor was she any scientist at all. This test is big money but hugely bogus.
Briggs-Meyers wrote the tests for a specific wartime purpose, to help allocate women to jobs that suit their personality. The test has been rewrittened countless times and has been validated as far as a study can be.
To say that the Brigg-meyers "rarely" gives the same result is an overstatement, and shows that you don't have a correct view of what personality is. Personality is not something that is easy to define, it is loosely categorized as a persistent pattern of a person's attitude, emotions, and behaviour. But there is also a part of personality that is entirely situation dependant, and also that person's personality can change, means that there is no possible way for a perfect test-retest validity score. What the Meyers-Brigg does is give the employer/psychologist a rough outline of how THAT PERSON views himself personality wise, and it should be corroborated with other personality tests to get a more concrete picture.
Brigg-Meyers isn't useless, but it doesn't define you either.