Play is often included in autism diagnostic assessments. These tend to focus on 'deficits' and non-autistic interpretation of observable behaviours. In contrast, a neurodiversity-affirmative assessment approach involves centring autistic perspectives and focusing on strengths, differences and needs. Accordingly, this study was designed to focus on…

In the last twenty-five years, the discussion surrounding validity evidence has shifted both in language and scope, from the work of Messick and Kane to the updated Standards for Educational and Psychological Testing. However, these discussions haven't necessarily focused on best practices for different types of instruments or assessments, taking…