Adult autism assessment is a new and fast-growing clinical area, for which professionals often feel ill-equipped. Autistic adults are often misdiagnosed which has enormous implications for their mental health. This accessible and comprehensive adult autism assessment handbook covers the most up to date research and best practice around adult autism assessment. It centers the person's internal experiences and sense-making in clinical assessment, rather than subjective observation, thus providing the clinician with a truly paradigm shifting Neuro-Affirmative approach to autism assessment. Traditional clinical assessment tools are comprehensively explored and unpacked to enable the clinician to have full confidence in aligning traditional criteria to the Autistic person's subjective experiences. Full of additional resources like language guidelines and an exploration of the common intersections between Autistic experience and the effects of trauma, mental health and more, this book supplies a breadth of knowledge on key areas that affect Autistic adults in everyday life. The mixed team of neurotypical and neurodivergent authors describe lived experience of Autistic adults, a how-to for conducting Neuro-Affirmative assessments and post-assessment support, alongside reflections from practice. This book also has a directory of further resources including downloadable forms that you can use to prepare for your own assessments and a downloadable deep dive into Autistic perception. This guide will also support professionals through every step of the assessment process.