"At present, INGOs, development agencies and media producers who attempt to engage audiences in issues of international development and social change operate in an increasingly saturated media environment, which is content rich but time poor. This leads to a search for innovative, web 2.0-native way ... s of presenting these often complex and challenging issues such as is interactive web documentary -a format that combines digital, interactive and social media with the documentary form. In this article I consider how interactive web documentary might affect audience engagement with issues of international development and social change via audience surveys and interviews based on two cases of idocs. Three modes of engagement appear to be enhanced by the format: active, emotional and critical engagement. Barriers to engagement -access, audience interest and tensions between discourses of gaming and issues of international development and social change- must be negotiated for the format to succeed in its aims." (Abstract) more