Children with cognitive disabilities are frequently included in general education classes to access grade level curriculum and socially interact with peers. To assist with the inclusion of students with disabilities, some schools assign instructional assistants to support general education teachers. However, there is often a lack of planning time or a planning protocol for the general education teachers, special education teachers, and instructional assistant to plan for the inclusion of students with cognitive disabilities. This action research project intended to increase the collaboration among instructional assistants, general education teachers, and special education teachers by developing a Community of Practice among the three groups of professionals. The action included a jointly attended professional development opportunity on strategies to include students with cognitive disabilities in the general education classroom, followed by monthly structured collaboration meetings in which the team jointly planned for the students with disabilities. Effectiveness of the project was judged using survey and interview questions derived from Theory of Planned Behavior and the self-efficacy construct from Social-Cognitive theory. The implementation of a team planning protocol increased the team’s collaboration by positively improving communication and connectivity among the team members.