An in-depth case study of one team of co-teachers' practice from multiple perspectives is described. A high school science co-teaching team and their students with disabilities completed surveys about their perceptions of co-teaching. Additionally, observations of the two co-teachers occurred to determine roles and types of interactions for each co-teacher during science instruction. Observational data revealed effective teaching behaviors demonstrated by each co-teacher. Detailed descriptions of the co-teachers' instruction are provided. The science educator was observed interacting with the large group twice as often as the special educator. The science educator also presented new content nearly three times as often as the special educator. The co-teacher surveys were consistent with the observational data. Both educators disagreed that the special educator was primarily the lead for instruction. Both educators strongly agreed they had an effective coteaching relationship, although the science educator indicated stronger agreement for parity in roles and responsibilities than the special educator noted. Forty-three percent of the students identified the science educator as in charge of lessons, while 43% identified both educators. Most students thought teaching was divided in half, and all students enjoyed having two teachers in science. Eighty-six percent of the students indicated team teaching was the most frequently used co-teaching model, and 14% indicated one teach, one drift. Implications for co-teachers' reflections on their collaboration, including the relevance of student perceptions (i.e., Who is the ''real'' teacher?), and the extent to which educators are prepared at preservice and inservice levels for co-teaching are discussed.

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One-teach/one-assist and one-teach/one-observe are the two most widely used co-teaching models. Special educators often take on the support role when these models are used. At times, co-teachers in the support role may be unclear about how to implement active instructional practices that engage students and improve student outcomes. In this article, opportunities to respond and contingent support are described as two research-based practices that can be implemented by co-teachers in the support role.