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 http://www.jstor.org/stable/10.1525/abt.2012.74.2.6 (Original work published February 2012)
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. http://doi.org/10.1007/s11165-014-9435-9 (Original work published 2014)