From Usability to Playability: Introduction to Player-Centred Video Game Development ProcessProvenzo, E.: Video kids. Harvard University Press, Cambridge (1991) Book Google Scholar ISO 9241-11: Guidance on Usability, also issued by the International Organization for Standardization (1998) Google Scholar Hassenzahl, M., Tractinsky, N.: User Experience – A Research Agenda. Behaviour and Information Technology 25(2), 91–97 (2006) Article Google Scholar Effie, L., Virpi, R., et al.: Towards
