There are a number of professional assessments that dive into the personalities and cognitive composition of managers, executives, experts, and rising talent. From Myers-Briggs Indicator to conducting Thorough 360' reports, to the true cost of not knowing what type of employees you have, makes it impossible to determine what you need. There are many benefits to having a third-party or outsider administer these assessments, for the benefit of all parties involved. You reduce your liability and the risk of negative fallout, while ensuring an appropriate degree of separation from the outcome of these diagnostics.
More importantly, when conducting professional assessments, it helps to know what types of assessments are available, how they should be given to employees, and how they should be calibrated to meet the needs of your company. There are many tests you can go into a drugstore and take, but there are many other tests that a medical professional should be the only one to administer. Similarly, the importance of using a third-party who has years of experience in this industry will greatly improve the effectiveness and accuracy of your assessments.