This chapter discusses principles of assessing learning. It defines assessment of learning as communicating information about student achievement and progress. Assessment should be an integral part of teaching and cannot be separated from it. Both formative and summative assessments are important. Formative assessment is used to identify material that needs clarification while summative assessment determines if learning outcomes are met. Effective assessment strategies discussed include allowing students to reflect and revise work, using rubrics for self-assessment, and collecting feedback through exit slips.