The document discusses four types of documentary forms: expository, observational, reflexive, and interactive. It provides descriptions of each type: 1) The expository mode uses a voiceover narration to shape the subject and audience perspective. It has strict control over meaning and response. 2) The observational mode simply records what happens in front of the camera without narration or polished production for more authenticity. 3) The reflexive mode not only examines its subject but also draws attention to how the documentary is constructed. 4) The interactive mode does not try to hide the filmmaker or process and encourages interaction between the subjects and camera through techniques like interviews.