Abstract
This paper reports on the development of game design ideas by children. These were specified in structured informal documents and low-fidelity paper prototypes. University students were challenged to develop children's informal specifications of games into high-fidelity interactive prototypes, and to have these tested with children. What issues did university students encounter in children's informal specifications? This paper answers such questions by explaining the organization of the development process for students in as much details so as to allow for its analysis and replicability in different contexts.