Project M2 is producing and disseminating curriculum materials in geometry and measurement for students in grades K-2. This builds on success of the M3 U.S. Department of Education curriculum grant for students in Grades 3-5. (www.projectm3.org). Project M2 units are advanced units for all students designed using research-based practices in mathematics, early childhood, and gifted education. Curricular materials focus on promising discourse and hands-on inquiry of rich problem-situations.