This document discusses systems of representation and theories of representation in communication. It explains that representation refers to how aspects of reality are constructed through different media, and involves how identities are both represented and constructed. It then outlines three main theories of representation: reflective/mimetic, intentional, and constructionist. It also discusses concepts from semiotics like the sign, semiological systems, semantic chains, and how meaning is constructed through representational systems rather than fixed by objects or language itself.