As states across the country continue their implementation of the Teacher Performance Assessment Portfolio (edTPA), a complex and high-stakes certification requirement for teacher certification, there are important lessons for educators and education advocates to learn from New York State's implementation. As Linda Darling-Hammond, developer and…

Describes a competency assessment system developed for use with preservice and inservice teachers and reports the reliability and validity of the instrument. Presents data from a tryout of the assessment system with a group of preservice science teachers. (CS)