A documentary explores actual people and situations in real life through various modes of representation. While there is debate around what constitutes a documentary, they generally aim to preserve, persuade, analyze or express information to audiences. Documentaries establish a "contract" with viewers by attempting to tell the truth in an authentic way, though filmmakers may have opinions. Common modes include expository, observational, interactive, essayistic and experimental styles. During production, documentaries consider ethics, representation of subjects, and relationships between filmmaker and subject. The filmmaking process involves research, treatment, interviews, footage gathering, editing, and finalizing with sound and text.