Researchers and teacher educators have given increased attention to co-teaching during the student teaching experience. Co-teaching facilitates an apprenticeship arrangement that encourages modeling of classroom practice for the candidate and a chance to implement directly what is being learned by the apprentice. The co-teaching model can be expanded to form a co-learning model in which there are three constituents of learners: the P-12 students, the candidate, and the cooperating mentor teacher. This co-learning model results in a synergistic effect that is greater than the sum of the parts. (Contains 1 table.)