While most items are sound in principle, this is very much focused on <i>web interfaces</i>, not user interface design as a whole, and even then on <i>websites</i> and not <i>webapps</i>.<p>There are different kinds of UIs, some focus on productivity, some on specific goals, some on fleeting interactions; some for a general audience, others for people with very specific domain knowledge. These principles are far from general, naming it a more casual "20 rules for web design" would be more appropriate.<p>For all we know, despite not pretty this could be a very efficient interface: <a href="http://www.apcconsultants.com/TCAR%20Control%20Screen25.JPG" rel="nofollow">http://www.apcconsultants.com/TCAR%20Control%20Screen25.JPG</a>