This document discusses the Prague School approach to linguistic functionalism. It outlines some key concepts in functional linguistics such as viewing language as a system focused on how it is used to derive grammatical and textual structures. It describes three main functional approaches - functional grammar, role and reference grammar, and systemic functional grammar. Systemic functional grammar in particular takes a discourse-oriented view of language and sees it as having three metafunctions: ideational, interpersonal, and textual. The document concludes that all functionalists agree language must be studied as a system of forms for conveying meaning in communication.