Defining Neurodiversity Affirming Psychology Practice for Autistic Adults: A Delphi Study Integrating Psychologist and Client Perspectives

Background: The term “neurodiversity affirming” has been used to describe an inclusive and strengths-based approach to mental health care, aligned with the neurodiversity paradigm and social model of disability. However, there is no known consensus on what neurodiversity affirming practice entails. Methods: We aimed to define neurodiversity affirming support in the context of Australian psychologists working with Autistic adult clients (what we have termed “neurodiversity affirming psychology practice”). Using a classical Delphi design with three rounds, we recruited expert panel members, including Autistic adults who had seen a psychologist, and psychologists (Autistic and non-autistic) who described their approach as neurodiversity affirming. The final panel consisted of 28 experts, aged 24–76 years ( M = 37.29, SD = 11.74). In Round 1, we gathered the panel members’ opinions on essential aspects of neurodiversity affirming support using a series of open-ended questions. In Round 2, the panel members rated key statements for importance, and in Round 3, items that had not met consensus criteria in Round 2 were re-rated. Results: In total, 104 statements reached consensus. We generated a model from the statements, which outlines a set of seven principles characterizing neurodiversity affirming psychology practice for Autistic clients. These principles are as follows: (1) a commitment to continued learning about autism, (2) providing safety to be one’s Autistic self, (3) finding a way to communicate, (4) authenticity and humility in practice, (5) validation of Autistic experiences, (6) Autistic informed person-centered support, and (7) genuine acceptance and appreciation of autism. Conclusion: Our results suggest that neurodiversity affirming support goes beyond a psychologist having knowledge of autism and taking a strengths-based approach. Rather, there are interconnected principles spanning from clear actions to more nuanced and subtle adjustments to the psychologists’ way of working that form the foundation of neurodiversity affirming psychology practice for Autistic adult clients.