Jakob Nielsen has some guidelines regarding number of users for usability test, and I guess they apply to field studies as well.
http://www.useit.com/alertbox/20000319.html http://www.useit.com/alertbox/quantitative_testing.html Personally, I think the statistical significance is rather unimportant when it comes to initial research and field studies. But if you have a certain goal of improved efficiency (like "the tasks should be performed x % faster") you need to be more meticulous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Posted from the new ixda.org http://www.ixda.org/discuss?post=31284 ________________________________________________________________ Welcome to the Interaction Design Association (IxDA)! To post to this list ....... [EMAIL PROTECTED] Unsubscribe ................ http://www.ixda.org/unsubscribe List Guidelines ............ http://www.ixda.org/guidelines List Help .................. http://www.ixda.org/help
