During the 1920s tests of special aptitude were viewed as measure of specific innate or heredity talents not based on experience. Aptitude tests were first developed by Bingham in 1930s. He refined aptitude as the measure of the probability of the success of an individual with training in a certain type of situation like a job. D. G. Paterson in late 1920s constructed three tests, Minnesota Mechanical Assembly Test, Minnesota Spatial Relation Tests and Minnesota Perp Board. Minnesota spatial test was standardized in 1976. Meier Art tests were approved in 1929 and 1963 respectively. Carl seashore and his colleagues constructed a musical ability test during 1920s and 1930s. Data was jointly constructed by G. K. Benett, H.G. Seashore and A.G. Wesman.