This set of professional development materials aims to to help mathematics teachers in grades 6-10 learn to identify, describe, and foster algebraic thinking in their students. Underlying the Toolkit is a core belief that good mathematics teaching begins with understanding how mathematics is learned. The focus here is on how students think about mathematics.

The Toolkit features four separate modules containing notes for the facilitator and reproducible blackline masters for the workshop participants. Each module concentrates on a different kind of classroom evidence and, in facilitated sessions, asks teachers to collect student and/or teacher data to share and analyze with colleagues. A module can be covered in four three-hour sessions.

The Guide for Teachers is based on Mark Driscoll's experiences in the professional development projects. Excerpts from discussions among the classroom teachers are included.