The original ideas on epistemic games, forms and fluency:
Collins, A., & Ferguson, W. (1993). Epistemic forms and epistemic games. Educational Psychologist, 28(1), 25-42.
Morrison, D., & Collins, A. (1996). Epistemic fluency and constructivist learning environments. In B. Wilson (Ed.), Constructivist Learning Environments (pp. 107-119). Englewood Cliffs, NJ: Educational Technology Publications.