In a word... no. Firstly, a common misconception about the MBTI is that helps determine the kinds of things that people will be good at by showing their aptitude. That way you can use it to figure out career and industry suitability in the workforce for example. Unfortunately it doesn't do that. What it actually does is try to show your preferences. So Myers-Briggs isn't about figuring out your ability but rather determining your comfort zone. It identifies the types of activities you'll like and be most content with; not necessarily those at which you'll be particularly good at.
In fact, the Myers-Briggs Type Indicator's practical use is overwhelmingly unscientific, and it's often criticized for this. Criticism starts with the fact that neither Jung nor Myers and Briggs ever employed scientific studies to develop or test their concepts. Instead they rely on their own observations, anecdotes, and intuitions. Horoscopes have a greater claim to scientific method than that!
Actually one obvious thing that Myers-Briggs has in common with horoscopes is its tendency to describe each personality type using only positive words. It is part of why horoscopes are so popular - they pretty much always tell people what they want to hear. They also use phrases that most people generally like to believe are true such as "You have enormous potential." They're also popular because they are presented as being personalized based on the person's sign. This has been called the Forer Effect, after psychologist Bertram Forer who, in 1948, gave a personality test to his students and then gave each one a supposedly personalized analysis. The impressed students gave the analyses an average accuracy rating of 85%, and only then did Forer reveal that each had received an identical, generic report. Belief that a report is customized for us tends to improve our perception of the report's accuracy
Due to these legitimate criticisms of Myers-Briggs and its unscientific underpinnings, the test is rarely used in clinical psychology. This is a clue people. When you see a topic that purports to be psychological being used in practically every professional discipline except psychology, you have very good reason to be skeptical of its actual value.
The test does have some severe inherent problems. It's been found that 50% of test takers who retake it score differently the second time. This is because nobody is strictly an 'E' or an 'I', for example, but somewhere in between. Many people are right on the border for some of the four dichotomies, and depending on their mood that day or other factors, may answer enough questions differently to push them over. Yet the results inaccurately pigeonhole them all the way over to one side or the other. This makes it possible for two people who are very similar to actually end up with completely opposite scores.
From the perspective of statistical analysis, Myers-Briggs' fundamental premise is flawed. According to Myers & Briggs, each person is either an introvert or an extravert. Within each group we would expect to see a bell curve showing the distribution of extraversion within the extraverts group, and introversion within the introverts. If the Myers-Briggs approach is valid, we should expect to see two separate bell curves along the introversion/extraversion spectrum, making it valid for Myers & Briggs to decide there are two groups into which people fit. But data have shown that people do not clump into two separately identifiable curves; they clump into a single bell curve, with extreme introverts and extreme extraverts forming the long tails of the curve, and most people gathered somewhere in the middle. Jung himself said "There is no such thing as a pure extravert or a pure introvert. Such a man would be in the lunatic asylum." This does not support the Myers-Briggs assumption that people naturally separate into two groups. Myers-Briggs takes a knife and cuts the bell curve right down the center, through the meatiest part, and right through most people's horizontal error bars. Moreover, this forced error is compounded four times, with each of the four dichotomies. This statistical fumble helps to explain why so many people score differently when retaking the test: There is no truly correct score for most people, and no perfect fit for anyone.
And this has been borne out in observation. A number of studies have found that personality types said to be most appropriate for certain professions, notably nursing or teaching, turn out to be no more prevalent among that profession than among the general population.
About all that Myers-Briggs is good for is to give people a quick snapshot of what their strengths and weaknesses might be, and of those with whom they interact. On the other hand you could get the same information just by asking them. As a tool for making career decisions, relationship decisions, or psychiatric assessment, it is pretty much useless.
