Interactive documentaries combine moving images, text, graphics, and digital interactions to create dynamic, web-based narrative formats. As a post-cinematographic expansion of the classical documentary film, they provide viewers with opportunities to select options and make decisions that co-determine what is shown and in what order. This volume brings together perspectives from film, media, game, and interface studies and includes analyses of key works as well as interviews with actors involved in making interactive documentaries. Key topics explored include opportunities for participating in interactive formats, challenges for the long-term archiving and accessibility of browser-based documentaries, and the influence of software and interfaces on the concept of the documentary.