This document discusses the principles of high quality assessment. It defines assessment as gathering information from diverse sources to develop a deep understanding of what students know and can do. High quality assessments provide results that demonstrate and improve targeted student learning. They also inform instructional decision making. Key characteristics of high quality assessments include clear learning targets, appropriate assessment methods, validity, reliability, fairness, positive consequences, and practicality. The document also identifies productive uses of assessments, such as learning analysis and curriculum improvement, and unproductive uses like grading or labeling students.