A job success rating scale was developed by use with 60 mentally retarded young adults (IQ's under 80, ages from 18 to 30), their parents, and employers. Interviews and job histories were analyzed; an experimental test battery measuring 101 aptitude and personality variables was administered. By factor analysis and statistical procedures, 17 tests were selected to compose the Laradon Occupational Success Predictive Battery. Cross validation was conducted with the group of 60 and a group of 51 with three subgroups. Analysis of predictive power indicated that in the subgroup most resembling the original 60, the predicted job success tended to correlate with the rated job success; female subjects were rated low; institutionalized retarded persons were not within the predictive scope; and the economic life of the community influenced what kind of job exposure the retarded person could have. Methods for perceptual remediation were also developed and tested on normal children (ages 5 to 17) and mentally retarded trainees at the Laradon Center. Results indicated that the mentally retarded showed more deviation in inconsistency measures than in accuracy. The tests are appended. (JD)