Thanks to an AMA InternetSIG member for this resource. This is another great synopsis of some research-based web design concepts.

Designing a website that takes into account the human element requires both an understanding of our nature as well as our physiological limitations. Usable websites incorporate human tendencies and limitation into its overall design.

Criteria for optimal web design (designing for usability): Software Usability Research Lab, Dept of Psychology, Wichita State University

Why do we have to define the criteria? Moreover, who wants to discuss these issues? I think the designers have already worked out working guidelines and work in compliance with them.