I would like to congratulate Prof. Taplin for his very interesting 
presentation.
I am convinced that role-plays could enrich my own classes. However, I think
that the use of role-plays requires a particularly open-minded attitude of 
the teachers.
Teachers have to be prepared to listen to their students properly, and they
should not mainly concentrate on imparting a pre-defined "correct" solution. 
Because reality is always much more complex than work with numbers and 
formulae, it is quite likely that some students come up with surprising 
ideas and arguments that deviate from the pre-defined "correct" (or 
"expected-as-correct") treatments of the consultation problems. To ignore or 
not to esteem such ideas properly can be very frustrating and the students 
may feel that it's just usual stats exercises wrapped up in a different way.
 
Therefore, teachers in general, but particularly those who use role-plays,
should know and accept that in such setups, as in the real
world, there is not just one correct answer which has to be learned, and that
it is quite worthwhile to try hard to find valuable thoughts in the student's
contributions from which even the teachers may learn something unexpected.