A Model Cornerstone Assessment is a model assessment unit with guidance for instruction in your classroom.  The authors of the 2014 National Theatre standards created Model Cornerstone Assessments aligned to the standards for grades Pre K-8, and at three levels in high school - proficient, accomplished, and advanced. Model Cornerstone Assessments for all grades were piloted and student work was collected and adjudicated in a national benchmarking process, to be shared as examples of standards based lesson planning and assessment.   Since the standards were published in 2014, additional Model Cornerstone Assessments have been created and piloted by EdTA utilizing teams of teachers and teaching artists, offering a full spectrum of models of assessment across diverse areas of instruction.