Matthew Miller (mattdm(a)mattdm.org) said:
So, I'm honestly asking: what are the odds that these few things
are the
only improvements that cause a disruptive change to user interaction? I
don't think it's unreasonable to wonder if there are other changes which fit
this category.
My concern with this line of thinking is that you're asking us to quantify
the unknown unknown, and define a time period of testing which is
'long enough' for us to catch all the unknown unknowns. This seems
impractical, in as much as it doesn't give us any clear criteria to define
success with.
Bill