Smith, M. K., Jones, F. H. M., Gilbert, S. L., & Wieman, C. E. (2013). The Classroom Observation Protocol for Undergraduate STEM (COPUS): A New Instrument to Characterize University STEM Classroom Practices. Cell Biology Education, 12, 618-627. http://doi.org/10.1187/cbe.13-08-0154 (Original work published Jan-12-2013)