A study examined the impacts of different education and training (E&T) assignments in Ohio's Job Opportunities and Basic Skills (JOBS) Training Program on the employment and earnings of Aid to Families with Dependent Children recipients who became mandatory JOBS clients in 1989 or 1990. Data on the JOBS assignments and earnings and employment of a random sample of 12,556 members of the JOBS evaluation's treatment group were obtained from Ohio's automated JOBS tracking and unemployment insurance systems. A comparison of the employment and earnings patterns of treatment group members who did and did not ever receive E&T assignments failed to uncover any statistically significant impacts of JOBS program participation for either the ever-assigned or never-assigned client groups. A comparison of outcomes of different types of E&T activity established that assignments to job clubs, postsecondary education, and job readiness training activities were generally associated with positive impacts, whereas assignments to basic education were associated with lower-than-expected earnings. Assignments to community work experience had no statistically significant effects on earnings. (Fourteen exhibits are included. Appended is the impact estimation method used to estimate program outcomes.) Contains 17 references. (MN)