The study will utilize two designs. Approximately 10 participants per year will complete the treatment, randomly assigned to one of two treatment levels. As each participant finishes, efficacy and effect size will be measured using a multiple-baseline single-subject design. Once all 30 participants have completed the treatment, effect size and the impact of dosage (treatment intensity) will be evaluated using a pretest-posttest group design, and correlations between participant characteristics and individual patterns of performance will be carefully described and analyzed.