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This series contains records from various studies that became Thayer's life work. Inspired by the original testing done in the 1930s, Thayer held his own major study to be included with his PhD thesis in 1951. When this study proved inconclusive, Thayer continued the testing again. After his thesis, the three major studies conducted were held in 1966, 1969 and 1972. Thousands of missionaries from a variety of boards and backgrounds were studied over the course of these tests. The tests were completed using computers at the University of Florida (1966); the University of West Virginia (1969); and Cleveland State University (1972). The collection offers the results and data tables from these three studies, as well as the complete set of computer cards from the 1972 study.