* [Design Requirements for Technologies that Encourage Physical Activity](http://www.katherineeveritt.com/papers/p457-consolvo.pdf)
* [Exploring the Potential of Gamification Among Frail Elderly Persons](http://gamification-research.org/wp-content/uploads/2011/04/12-Gerling.pdf)
* [From Game Design Elements to Gamefulness: Defining “Gamification”](http://dl.dropboxusercontent.com/u/220532/MindTrek_Gamification_PrinterReady_110806_SDE_accepted_LEN_changes_1.pdf)
* [MoviPill: Improving Medication Compliance for Elders - Using a Mobile Persuasive Social Game](http://www.ic.unicamp.br/~oliveira/doc/Ubicomp2010_MoviPill.pdf)