Participants will receive ten 45-60-minute sessions (two times per week) in person in their residence to address real-world performance with an emphasis on START strategy, task-specific practice, and guided discovery to perform social participation activities. In session 1, participants will be guided to select 3 to 5 meaningful social activities and prioritize them. In sessions 2 - 9, participants will use structured START strategy worksheet to try the selected activity; assess execution (e.g., what went well, what did not); reflect on a plan with specific strategies and to address identified challenges; and try social participation activities again. The interventionist will use guided discovery to support START strategy application and to elicit problem solving skills. This process will be repeated iteratively across sessions. In session 10, participants will summarize lessons learned and generate an action plan for after the intervention.

Fidelity is measured using Strategy Training (ST) and Acceptance and Commitment Therapy (ACT) fidelity tools.

All intervention sessions will be video recorded and a random 20 percent will be rated by independent evaluators trained by the principal investigator. ST fidelity will be assessed with the 10-item fidelity tool with 8 or more items rated as adequate or excellent indicating adequate fidelity. ACES fidelity will be assessed with a 22-item tool generated from the 10-item ST and 12-item ACT fidelity tools, with 18 or more items rated as adequate or excellent indicating adequate fidelity. The a priori criterion for adequate fidelity was that equal or greater than 80 percent of intervention sessions are rated with equal or greater than 80 percent of adequate fidelity for each START and ACES intervention.

Client satisfaction is measured using the Client Satisfaction Questionnaire. The Clients Satisfaction Questionnaire is an 8-item assessment of satisfaction with the intervention program, rated on a 4-point scale that ranges from 1 to 4 in each item. An average score will be computed for each participant. High scores indicate high satisfaction. The a priori criterion for satisfaction was equal or greater than 80 percent of the sample has mean Client Satisfaction Questionnaire score of equal or greater than 2.5.

Changes in social participation measured by PROMIS Ability to Participation in Social Roles and Activities.

The PROMIS Ability to Participate in Social Roles and Activities (APS) is a self-report measure that assesses difficulty participation in social roles and activities. APS is an 8-item short form rated on a 5-point scale. High scores indicate high difficulty. The total raw score will be transformed into a t-score that ranges from 0 to 100, with a mean of 50 and a standard deviation of 10.

The a priori criterion for change was a small effect size of change (d=0.2 or greater).