Preventing unwanted communication in ICT-based exams by using free software

We describe an ICT-based exam system for the Norwegian school system that prevents candidates from using the diverse communication devices available on modern computers to cheat. Based on the requirements for such a system from the authorities we show various solutions. We developed the exam system by using free software and the peer production model. We discuss our experiences with free software for the public sector, and point out areas where free software still has challenges to overcome when introduced as an alternative.