The document describes a prereading plan strategy used to assess and build students' background knowledge before reading. The strategy involves 3 phases: (1) students write what they know about a topic and discuss, (2) explain their associations and consider others' perspectives, (3) refine their knowledge before reading. The document provides an example application of the strategy where students explore their understanding of "equality" before reading about Sylvia Mendez, who desegregated California schools through her landmark lawsuit.