The document discusses using assessment to support teaching and learning in the classroom. It defines assessment as the process of gathering information about a student's learning. There are three main types of assessment discussed: assessment of learning, which evaluates student learning after instruction; assessment for learning, which provides feedback to students during the learning process; and assessment as learning, which involves students in self-assessment. The document emphasizes the benefits of formative assessment, or assessment for learning, in improving student outcomes and equity. Key principles of formative assessment include sharing learning intentions, success criteria, quality questioning, and feedback.