“…During this three-minute waiting period, participants and the adult confederate can talk to each other. Secondary outcomes include autistic characteristics (Social Responsiveness Scale-2 [SRS-2] [60]), generalised social skills (Snack Time Assessment of Relationships and Social Skills [STARSS] [59, 61]), adaptive functioning (Adaptive Behaviour Assessment System-II [62, 63]), self-esteem and self-concept (Self-concept Scale Draw-A-Person [SCS-DAP] [64], Child Rosenberg Self-Esteem Scale [CRSES] [65]), cognitive development and psychosocial well-being (Koppitz Draw-A-Person Test [66, 67], Child Outcome Rating Scale [68, 69]), perceived school support school level [33], and parental reflective functioning [70]. Feasibility outcomes include acceptability, appropriateness, and negative effects assessed via quantitative data (fidelity checklists, recruitment rates, attendance rates, homework completion rates, Group Session Rating Scale [71], Theoretical Framework of Acceptability Questionnaire [72], and Negative Effects Questionnaire [73]) and qualitative data from focus groups held post-intervention (ITG: post-training [T3] and follow-up [T5]; DTG: post-training [T5]).…”