1. Contextual design: Defining customer-centered systems;Beyer,1998
2. Change by design: How design thinking creates new alternatives for business and society;Brown,2009
3. Sketching User Experiences. Getting the design right and the right design;Buxton,2007
4. Sketching user experiences: Getting the design right and the right design;Buxton,2010
5. Blind variation and selective retentions in creative thought as in other knowledge processes;Campbell;Psychological Review,1960