In allowing
this degree of freedom, there is always
92 Journal of College Science Teaching
research and teaching
the chance that some groups will not
represent all levels of thinkers or that
some students may not participate
actively in the public presentation
components of the exercise.
groups according to student ability
or the roles that they perform. Also,
although all students are encouraged to
present the group’s response at some
point during the semester, no student
is ever forced to do so