Factors influencing the implementation of parent-mediated intervention are insufficiently studied. This study examines for the first-time factors of implementation into clinical practice across the world of Pediatric Autism Communication Therapy, an internationally disseminated, evidence-based, parent-mediated therapy. From both the parents' and the professionals' perspectives, parents attitudes (e.g. self-reflection abilities and videotaping management) and life-circumstances (e.g. stressed families condition and time) were central factors. In this type of therapy, the target is a child's development; still, this improvement is dependent on the parent's behavior when interacting with their child. What's more, Pediatric Autism Communication Therapy method (video reflection, empowerment of parent, play-based) was enabler according to most of the parents. And more, most professionals report factors linked to the Implementation Process that is planning, execution, reflection and assessment in implementation of a new therapy. Indeed, the professionals underlined barriers related to the population seen in practice, flexibility of schedule, support from colleagues and manager. All these factors could be improved and addressed with a formal implementation plan including factors related to the parents of each country.