RESUMEN
LAY ABSTRACT: Self-report measures are frequently used for research and clinical assessments of adults with autism spectrum disorder. However, there has been little research examining agreement between self-report and informant-report in this population. Valid self-report measures are essential for conducting research with and providing high quality clinical services for adults with autism spectrum disorder. This study collected measures from 40 pairs of adults with autism spectrum disorder and their caregivers on measures of symptom severity, daily living skills, quality of life, and unmet service needs. Caregiver and self-report responses were highly associated with one another on all measures, though there were significant gaps between scores on the measures of daily living skills and quality of life. It is also important to understand how each informant's responses relate to outcomes in the areas of employment and independent living. Using self-report and caregiver-report together better predicted outcomes for the adult with autism spectrum disorder than scores from either individual reporter alone. These findings show that there is unique and valuable information provided by both adults with autism spectrum disorder and their caregivers; a multi-informant approach is important for obtaining the most comprehensive picture of current functioning, identifying unmet service needs, and creating treatment plans. This research also highlights the importance of including and prioritizing self-report perspectives in shaping service planning.