A Personalized System of Instruction (PSI) program for nontraditional adult learners was developed, implemented, and evaluated for the purpose of making recommendations as to the need for and nature of further related research. Proposed program settings were two classes of adult basic education students and one of prison inmates. A case study approach was planned for each selected implementation site with primary emphasis on collection of observational information and collection of some comparison data. Due to internal problems, the prison class was dropped and an alternate setting selected, and actual enrollment was lower than expected. PSI students completed over 100 units of language and mathematics instruction. Almost a grade level increase in reading comprehension was indicated as was more than a grade level increase in both arithmetic computation and problem solving. Researchers also determined questions considered to represent issues for further research for PSI potential for teaching nontraditional adult learners. (Appendixes, amounting to over one-half of the report, include the introductory unit, "What is PSI?"; a sample language unit; practice language mastery demonstration; Instructions for PSI Classroom Manager; Proctor Guide; and sample program forms.) (YLB)