The purposes of this study were to determine the occupational opportunities for which high school graduates can qualify in the field of digital computer installations, the knowledges and skills needed for employment, the training needed, the pattern of advancement, the effect of automatic coding, and significant recent developments. Sixty-nine computer installations in Ohio were surveyed by mail and 54 occupations were used as a basis for the study. Twenty-seven first-level entry occupations for which high school graduates can qualify were found. In all, 36 specific conclusions were derived and presented in these two volumes. Appended are selection tests, validation studies, forms, and other materials used in the survey. This Ph.D. dissertation was submitted to The Ohio State University. (MM)