Personality tests are very helpful to scientists , but creating accurate tests is a challenge. The most common personality tests are structured personality tests, which ask respondents to answer in one of a few fixed ways. The most extensively researched structured personality test is the MMPI. The MMPI uses an empirical method of test construction, which means the test is built with two or more criterion groups, and then items are examined to determine which best distinguish the groups. The MMPI is considered very reliable, but it still has it's problems.
Another way of constructing tests is the rational/theoretical method, in which developers begin with a clear-cut conceptualization of a trait and then write items to assess that conceptualization. The NEO-PI-R uses this approach and has demonstrated good validity, but not all rational/theoretical tests display this validity. A good example is the Myers- Briggs Type Indicator.
The Meyers-Briggs test is given several million times a year. I myself have taken this test in my school multiple times and my counselors consider it a helpful tool in life decisions. Many companies give the test to predict job performance and satisfaction. There are many versions of the test available online. These websites tell you they can help your life, because the tests tell you what you should be doing to make yourself happy. According to the video below the Meyers-Briggs test is the most well established personality test in the world!
How accurate are these tests really? According to out text book, "Most respondents don't obtain the same MBTI personality type on retesting only a few months later, and MBTI scores don't relate in especially consistent ways to either the Big Five or measures of job preferences". So why do people still take the Meyers-Briggs test, and put such faith in it? I think people like the idea of having their personality labeled. We as humans like things to be organized and understandable. The Meyers-Briggs test allows us to clearly identify ideas about ourselves without thinking too much about it. But because the test seems to be so inaccurate, I think people should be more educated on the reality of its invalidity. I also think companies should use different methods to determine personality.