Abstract
In view of the lack of any clear available data, the incidence of underachievement at the high school level was determined. An underachiever was defined as a student with at least average intelligence whose achievement test placement is at least one standard error of estimate below expectancy. Subjects were 1,263 high school students in a suburban community. Correlation coefficients between the Otis and the National Educational Development Tests were computed and regression equations developed. The incidence of underachievement was 26 percent with the NEDT Composite Score as achievement criterion. The high proportion of students in an affluent community who underachieve is alarming.

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