I really doubt, the elements the David memtioned here, compose the
foundation of interaction design ( who has succeed done this ? :) ), but
it's a interesting (or a bit abstract ?) reading.
How could we deepen the understanding of ixd by these elements?
for e.g., the best elements i every read is from cooper's book, (Persona)
Goal, Senario, etc. these elements really depend the understanding of ixd,
as far as i know.
And David's elements, make a bit abstract and confused here, (sorry to say