Olga, here are some books that have helped me with this issue.
Nardi, Bonnie. (Ed.) _Cognition and Context_
Winograd, Terry and Flores, Fernando. _Understanding Computers and Cognition_
Carroll, John M. (Ed.) _Designing Interaction_
Bodker, Susanne _Through the Interface_
Authors who have written other books and articles about the subject include
Graham Button and Victor Kaptelinin.
I hope this helps!
-- Clay Spinuzzi Iowa State University 206 Ross Hall Ames, Iowa 50011 spinuzzi who-is-at iastate.edu 515-294-9325