AIM (Assessment, Instruction, Mastery), a performance-based assessment developed in Oregon, was piloted in 25 volunteer-based programs in Pennsylvania. During the program year ending in June 1999, 190 tutors and program staff from 20 agencies attended training workshops on using the AIM system; 13 programs receiving training reported 136 tutors were using AIM with 141 learners; 59 percent of the tutors responding to an end-of-the-year questionnaire reported they had been able to integrate AIM into their lesson plans on a regular basis, and 52 percent reported learner progress on the AIM; and approximately 100 percent of the learners using AIM progressed 1 or more levels over a 4-5 month period. Thirteen programs responded to an end-of-the-year questionnaire and reported that the training they received adequately prepared them and their volunteers to use this assessment; learners are excited about being a part of the process; and tutors feel better prepared to focus upon the life skills that many of the learners need. Volunteers reported that, by using the goal setting segment of the AIM and in discussing selection of skills from the checklists with their student(s), a true partnership between tutor and learner emerged. (Appendixes include a master set of AIM guides; summary of responses to AIM questionnaires; test record form; lesson planning activity; and sample AIM curriculum resources.) (YLB)