The Performance Task Development Project for Mathematics and Science seeks to build participant capacity in the understanding, use, and development of formative performance asessment. Guided by WestEd's instructional and assessment experts, grade specific teams work collectively to design, field test, and score formative performance assessments in grades K-12. Through this process participants deepen their understanding of performance assessment and the instructional implications these tasks have for teaching and learning. (Participation in this project is by invitation only.)