The spaces in which public deliberation most often takes place are institutionally, technologically, and scientifically complex. In this article, we argue that in order to participate, citizens must be able to invent valued knowledge. This invention requires using complex information technologies to access, assemble, and analyze information in order to produce the professional and technical performances expected in contemporary civic forums. We argue for a civic rhetoric that expands to research the complicated nature of interface technologies, the inventional practices of citizens as they use these technologies, and the pedagogical approaches to encourage the type of collaborative and coordinated work these invention strategies require.