The purpose of this project is to develop the Supporting paraprofessionals-Teachers use of Evidence-based practices with Learners having Autism (STELA) program, a professional development intervention targeting the knowledge and skills that paraprofessionals need to implement evidence-based practices (EBPs) for students with autism spectrum disorder (ASD). Increasingly, paraprofessionals have the responsibility of delivering instruction and intervention to students with ASD under the supervision of the special education teacher. However, paraprofessionals often need additional training in order to implement EBPs to meet the needs of these students. The current project aims to address this gap by designing a professional development program, STELA, to support paraprofessionals' use of EBPs for students with ASD and ultimately improve student engagement and learning.