Garron G. Gianopulos Confrey, J., Gianopulos, G., McGowan, W., Shah, M., & Belcher, M. (2017). Scaffolding learner-centered curricular coherence using learning maps and diagnostic assessments designed around mathematics learning trajectories. ZDM-MATHEMATICS EDUCATION, 49(5), 717–734. https://doi.org/10.1007/s11858-017-0869-1 Confrey, J., Maloney, A., & Gianopulos, G. (2017). Untangling the "Messy Middle" in Learning Trajectories. MEASUREMENT-INTERDISCIPLINARY RESEARCH AND PERSPECTIVES, Vol. 15, pp. 168–171. https://doi.org/10.1080/15366367.2017.1404370