sentences:  There, he was a mentor to Isabel Briggs Myers, whom he taught test construction, scoring, validation, and statistics, and who went on to develop the Myers-Briggs Type Indicator.During World War II, Hay served as Deputy Administrator for the Office of Price Administration.In 1943, he launched Hay Group, a management consultancy that focused on improving the personnel side of businesses, which he believed was a neglected and underdeveloped area.