Practice theory as a tool for innovation Krestine Mougaard, Henriette Nielsen, Mikkel Proschowsky, Tobias Toft, Thor Højlund Olsen, Max Munnecke, Torben Lenau SIDeR 2008, March 27 – March 28, 2008, Sønderborg, Denmark, ACM 978-1-60558-012-8/08/04. Abstract: In this paper the use of practice theory is describe as a tool for innovation. Throughout the paper this theory is applied on intelligent light at Roskilde Festival as a case. First the method is explained, secondly the process, and the empirical work and then the final outcome - the product. At last the method is reflected and the future work is described.