Three papers that will be presented in this session are nominees for best paper.

The first one is -
"Effort-based Tutoring: An Empirical Approach to Intelligent Tutoring"

Making wayang math tutor better -

student model - mistakes, hints, time

example, if less mistakes, less hints, less time => mastery without effort, decision => increase problem difficulty

what is problem difficulty?
correctness effort factor = (mistakes made by student)/ (maximum mistakes students made)

tests to determine problem difficulty -

how accurate problem difficulties are?
axiom - pairs fo similar problems should have similar difficulty level

different from rest?
different from each other?
similar to itself?

parameters to switch topics or knowledge units -
knowledge units are chunks of problems that use similar skills