I'm working my way through it now, but wanted to go ahead and share it
with y'all.
Here's a very brief summary of what the 8-page article discusses:
"Our research shows that this underlying motivational energy takes the
form of three basic psychological needs: Those of competence, autonomy,
and relatedness, which comprise the major components of what we call
the Player Experience of Need Satisfaction (PENS). "
We've discussed how to make a game that is used for learning attractive
to play. This article may provide some insight.
-- Libby