The document discusses portfolios and their functions in assessing student learning. It defines a portfolio as a purposeful collection of a student's work that exhibits their progress, achievements, and competencies. There are three main types of portfolios: 1) growth/development portfolios that show changes over time, 2) showcase/best work portfolios that display a student's best accomplishments, and 3) assessment/evaluation portfolios that document learning based on curriculum standards. The document provides examples of the purposes and possible inclusions of each portfolio type to effectively assess student learning and progress.