This document summarizes several narrative theories proposed by different theorists:
1) Tzvetan Todorov analyzed plots and found most narratives follow a structure of equilibrium, disruption of equilibrium by an outside force, and a return to equilibrium.
2) Vladimir Propp analyzed over 100 narratives and proposed they can be classified by character roles and functions such as hero, villain, donor, dispatcher, and princess.
3) Claude Levi-Strauss studied myths and found they reflect cultural values through binary oppositions between corresponding scenes, characters, or items.
4) Roland Barthes suggested narratives work through five codes - action, enigma, semic, symbolic, and cultural - that activate the reader's interpretation.