Stuart Hall's theory of encoding/decoding argues that media communication involves two processes: media producers creating texts and audiences making sense of those texts. However, neither have total power as production and interpretation occur within existing conventions.
Edward Herman's propaganda model proposes five political-economic filters that shape mass media messages: size and ownership concentrating media power; advertising dependence incentivizing corporate-friendly coverage; sourcing from PR and elite experts; flak against dissenting voices; and anticommunism historically justifying censorship.