This document discusses the roles and functions of language in society according to linguist M.A.K. Halliday. It identifies six roles of language: instrumental, regulatory, interpersonal, personal, heuristic, and informative. For each role, examples are provided such as letters for commerce, directions, interviews, and academic reports. The document instructs students to select one role of language and report on it using examples. Diagrams, tables, and maps are also presented as ways to explain complex ideas visually.