Jere Confrey, Meetal Shah, and Emily Toutkoushian presented four talks at the NCME Special Conference on Classroom Assessment held at the University of Kansas at Lawrence from October 8-10. Jere led a panel discussion on “Why Purpose and Grain-Size Matters in the Design of Learning Trajectories/Progressions- -Based Classroom Assessment”. Meetal presented the results from her dissertation study centered around the assessments in Math Mapper that measure geometric similarity. Emily and Jere presented validation results for classroom assessments from contrasting learning trajectories within Math Mapper. Jere was also part of invited panel discussion with other researchers who have developed or used organized learning models (learning progressions or learning maps).