This is a multi-method study to develop and validate an instrument to measure teachers' self-efficacy for teaching students with autism spectrum disorder (ASD) in inclusive early childhood classrooms, "Teacher Self-efficacy for Teaching Students with ASD Inclusive Classrooms Scale": TSE-ASDI. I conducted literature and expert reviews as…

While assessments of general social proficiency constructs are numerous in the ASD literature, and in the special education literature more broadly, investigations of the latent structure(s) of "vocational-specific" social proficiency constructs have yet to receive serious empirical investigation. Furthermore, trends in this literature…

Autism Spectrum Disorder (ASD) is a lifelong developmental disability that affects social development and social communication. As the prevalence of ASD increases, more children on the spectrum are growing into adolescents and young adults. Adolescents have unique needs as they transition from childhood to adulthood. One imperative skill deficit…

Rating scales are often used as part of the evaluation process to diagnose autism spectrum disorder (ASD). Rating scales that are modeled after the experiences and understanding of the Caucasian American race may not reflect the unique experiences of individuals from other races or ethnicities. If parent ratings do not uniformly identify the ASD…

Early identification and intervention of an Autism Spectrum Disorder (ASD) can have beneficial effects that extend into later life. However, currently used instruments have difficulties detecting children who may have an ASD. The current study investigated the utility of a newly published measure, Autism Spectrum Rating Scales (ASRS). Participants…

The development and psychometric characteristics of the Minnesota Visual Autism Symptom Scale (MN-VASS) was described. The relationship between the literature surrounding autism symptoms, the diagnostic criteria for autism, and the resulting content of subscales was presented. Item analyses were conducted using item total correlations. All of the…

This dissertation consists of four chapters. Chapter 1 provides an introduction to the self-determination literature documenting the importance of promoting the self-determination of transition and secondary age students with disabilities, as well as a summary of research examining the self-determination of students with disabilities across…