Structuralism is a 20th century intellectual movement that analyzed language, literature and society with a focus on underlying structures. It was influenced by Ferdinand de Saussure's work in linguistics and viewed language as a system of signs. Structuralism looked at both the surface structures that are visible in communication and deeper, abstract structures, and used diachronic and synchronic methods to study how language changes over time and is used. Key thinkers who contributed to structuralism included Saussure, Barthes, Chomsky, Culler and Levi-Strauss.