The document discusses the PreP (Pre-reading Plan) procedure for assessing students' prior knowledge before reading a text. The PreP procedure has three phases: (1) students brainstorm initial associations about a topic, (2) students reflect on their initial ideas, (3) students reformulate their prior knowledge based on new information. Activating relevant background knowledge, or schema, is important for comprehension, but teachers can help build schema through pre-reading activities if students lack relevant knowledge. The PreP procedure helps teachers evaluate students' existing schema about a topic and identify learning activities needed before reading.