Using the MBTI in the hiring process is unethical for the same reason as asking if a person has a car is illegal---both create a bias and do not allow for people having the ability to do the job using their ingenuity. After hiring, using the MBTI as part of the new hire training process would be an excellent use of the tool. All of us can benefit from learning about our own preferences and considering how to use them--or how to consciously and deliberately act differently-- to best perform the job. I can 't think of a better use of the MBTI in the hiring process. It lets the new hire know 'we value you, want you to succeed, and want to help you fit into our company.
Self-report inventories are often a good solution when researchers need to administer a large number of tests in relatively short space of time. Another strength is that the results of self report inventories are generally much more reliable and valid than projective tests. Scoring of the tests a standardized and based on norms that have been previously established. However, self report inventories do have their
References: much correlated and not of separate meanings or purposes.