how do you web professionals tackle user experience and interaction design?

I seem to use similar approaches (to Andy)in my design processes, although usability has to be defined for individual sites as Andy pointed out in the last question.

Never ever test it yourself as you know how the system is supposed to work. I think most designers trip up here. If you have no budget for usability testing (at least try to obtain some) then at least get your partner/Mum or whoever to go round the site. I guarentee that they will pick up 3 problems with your design in the first 60 seconds and you’ll be better off from it.

This brings out another point - user testing doesn’t end once the site is launched. Listen to your audience!

I know you interviewed Andy as well?? In any case: this short interview highlights common principles of user experience in terms of design but they are nevertheless good starting arguments.