This document discusses assessment for 21st century learning. It defines assessment and explores different aspects of 21st century learning, including types of learning (understandings, skills, dispositions, and content knowledge), examples of 21st century skills, and potential shifts needed in assessment. The document examines how to best assess understandings, skills, dispositions, and content knowledge. It provides rubrics to assess middle school students' development of complex problem solving skills and dispositions.