> *Good* designers are, in fact, more enlightened about
> good design than *good* usability practitioners and it is that indefinable
> something that separates art from science that makes it so.

Hmmmm.  Not all of us live in that dichotomous world that divides art from 
science.  We may have to agree to disagree, if our perceptions about that are 
so different.

It seems you assume that a designer can't be a usability practitioner, and I 
think he or she must be both to be good at either one.  I perceive usability 
and design as complementary considerations that combine to yield varying 
degrees of satisfaction in user experience.  It sounds like your definition of 
a usability practitioner is one who, like Jakob Nielsen, only assesses the work 
of others and designs nothing himself.  Or one engaged in the metrics of 
usability.  Am I interpreting you correctly, Joseph?  I don't meant to be 
contentious at all, only to understand your perspective.

Evaluating the usability of design -- we're talking interaction design, right? 
not something painted on afterward or applied as a skin? -- is a rightful part 
of the design process, and many factors argue for its integration long before a 
prototype is presented for testing. Similarly, it makes no sense to ignore 
accessibility considerations from the start.  Accessibility and usability are 
hard to separate anyway.  Good design doesn't need to be retrofitted with 
anything, because it's designed with all essential criteria in mind from the 
beginning.  Of course, these are ideals and our real-world experience has to 
make allowances for all kinds of circumstances.  But given the opportunity to 
do it right, my own life experience with everything from fixing cars to fixing 
websites tells me that it's very hard to go back in and retrofit usability when 
it was not considered important at the outset or at other points in the design 
process.

Regards,
Jeff Seager

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