PT - JOURNAL ARTICLE AU - Jones, Nathan AU - Winters, Marcus A. TI - Are Two Teachers Better Than One? AID - 10.3368/jhr.0420-10834R3 DP - 2022 Feb 04 TA - Journal of Human Resources PG - 0420-10834R3 4099 - http://jhr.uwpress.org/content/early/2022/01/31/jhr.0420-10834R3.short 4100 - http://jhr.uwpress.org/content/early/2022/01/31/jhr.0420-10834R3.full AB - Co-teaching, in which a general education teacher and special education teacher collaboratively provide instruction to students with and without disabilities in the same classroom, is widely endorsed as a strategy to give instructional support to students with disabilities within inclusive environments. We leverage longitudinal administrative data in Massachusetts to provide the first causal estimate for the effect of co-teaching across a large public school system. We find evidence that co-teaching leads to statistically significant test score improvements for both students with and without disabilities. However, the benefits for students with disabilities are much smaller than reported in prior studies.