BEST Instruments were developed over a period of twenty years, and have been taken by countless individuals, including employees at over 40% of the Fortune 500 companies. Validity and reliability studies were made using data collected from more than 4,000 administrations of the BEST instruments, and; in all cases, the instrument results were consistent, and reported face validity was well over 90%. There are 14 tests that you can administer; choose the ones that work for you. To talk with Jodie, call toll free, 1-800-748-9073