Randy J. Pagulayan Keith Steury Bill Fulton Ramon L. Romero Designing for Fun: User-Testing Case Studies. 137-150 2005 Funology http://dx.doi.org/10.1007/1-4020-2967-5_14 series/hci/BlytheOMW05 db/series/hci/BlytheOMW05.html#PagulayanSFR05