10 Nov 2011 Happy Usability Day! Today is the World Usability Day (WUD), and 43 countries are celebrating in 172 official events. Montreal is holding a meeting tonight at HEC and we hope to see you there. To celebrate this day with you all, UXalliance has just released a free study on Cultural differences in usability testing (PDF). Happy Usability Day to all UX Professionals and enthusiasts!