This dissertation is a quantitative research paper that includes data from teachers in Louisiana elementary schools. The critical focus of this dissertation centers around elementary teachers being prepared to educate students with Autism Spectrum Disorders. Throughout this paper, teacher preparation programs, professional learning, and evidence-based practices are explored. Teacher effectiveness as well as teacher self-efficacy is explored in relation to the preparation of elementary teachers in educating students with Autism. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]