How products behave and users react is the responsibility of an interactive designer. What are key points to consider, typical mistakes to avoid, and principles to follow - Dan Saffer, an experience design director at the design consultancy Adaptive Path, shares in his interview to DI.

Fabio Sasso is a Brazilian graphic designer and photoshop expert. He is Web-wide known for his excellent photoshop tutorials regularly published on PSDTuts and on his blog at Abduzeedo.com. Having graduated in 2003 with a degree in graphic design, Fabio founded a web design studio called ZEE, with Fabiano Meneghetti, an architect and designer from Porto Alegre, Brazil.