We just uploaded in the list of our publications a book chapter related to the classification of Serious Games. This chapter presents the classification system used on the site http://serious.gameclassification.com/ to classify more than 2600 Serious Games. It was published last year in a book titled Handbook of Research on Improving Learning and Motivation through Educational Games: Multidisciplinary Approaches, and it's now freely available on our website (draft version).
Keywords : serious games, classification