Collaborative early intervention (EI) service delivery is enhanced by professional development focused on knowledge and skills in the content and process of delivering services. This article describes a multicomponent online professional development course designed to build infant toddler specialists' capacity to support children with communication needs and their families. A preliminary program evaluation approach was used to examine the impact, feasibility, and provider satisfaction of the initial implementation of the course. Findings indicated that providers enhanced their knowledge and skills in communication development and intervention and applied those skills within family-centered services in natural environments. Specifically, they demonstrated course competencies in identifying communication acts, developing intervention targets, and planning communication-promoting strategies within the context of coaching caregivers in activities and routines. Implications of professional development designed within the framework of adult learning principles, evidence-based content, and empirically supported instructional methods are presented in relation to the effectiveness of EI. (Contains 2 tables and 3 figures.)