Wikipedia
Co-teaching is when two educators work together to plan, organize, instruct and make assessments on the same group of students, sharing the same classroom. This approach can be seen in several ways. Teacher candidates who are learning to become teachers are asked to co-teach with experienced associate teachers, whereby the classroom responsibilities are shared, and the teacher candidate can learn from the associate teacher. Regular classroom teachers and special education teachers can be paired in co-teaching relationships to benefit inclusion of students with special needs.
Recently, in Ontario the Full-Day Early Learning Kindergarten Program has been implemented where an Ontario Certified Teacher and a Registered Early Childhood Educator co-teach in a kindergarten classroom.
To evaluate the effectiveness of co-teaching, partnerships can use the Magiera-Simmons Quality Indicator Model of Co-Teaching, which gives standard definitions for co-teaching skills through 25 quality indicators and a rating scale. Co-teaching is often evaluated on the amount of shared leadership is present, the amount of co-planning time, honest communication between the two educators, and how much respect and trust is present in the relationship.