This document discusses different types of assessments used to evaluate student learning and drive instruction. It describes formative assessments, which are used during learning to inform teaching, and summative assessments, which are administered after learning to measure student achievement. The document then outlines four categories of assessments: screening assessments identify students who may need support; diagnostic assessments pinpoint specific skill deficits; progress monitoring assessments evaluate the effectiveness of interventions; and outcome assessments indicate if program goals were met by comparing performance to standards or peers. Examples are provided for each category.