Previous studies on parenting adult children with ASD were scarce, and their intervention protocols mainly were derived from established work with children. Development of an applicable adult-oriented protocol and demonstration of its effectiveness is warranted. The present study outlined the development and evaluation of Core Autism Parenting Skills, which targets to enhance parenting self-efficacy intervention for adult children with ASD by addressing two intervention goals in parallel: acquisition of parenting skills and cultivating positive attributes. In CAPS, PSE is operationalised into (...) four parent roles: to observe, reinforce, empathise, and accompany, each with requisite attributes, skills, and prescribed training. Twenty-seven parents with adult children with ASD were recruited. They completed measures assessing their PSE, competence in the four parent roles, and emotional well-being at pre-training, post-training and 2-month follow-up. The intervention was well-received by the participants and reported significant improvements in PSE, parent role competence at post-training and 2-month follow-up. The applicability of PSE and parent role competence in constructing effective parenting intervention for adult children with ASD was supported. (shrink)