Publications by John E. Opfer

Nehm, R. H., Beggrow, E. B., Opfer, J. E., & Ha, M. (2012). Reasoning About Natural Selection: Diagnosing Contextual Competency Using the ACORNS Instrument. American Biology Teacher, 74, 92-98. Retrieved from (Original work published 02/2012AD)
Federer, M. R., Nehm, R. H., Opfer, J. E., & Pearl, D. (2014). Using a Constructed-Response Instrument to Explore the Effects of Item Position and Item Features on the Assessment of Students Written Scientific Explanations. Research In Science Education. (Original work published October-29-2014)