@article {24961,
	title = {FuturePlay 2009 at GDC Canada International Conference on the Future of Game Design and Technology},
	journal = {From playability to a hierarchical game usability model},
	year = {2009},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-72049086741\&partnerID=MN8TOARS},
	author = {Nacke, L.}
}
