Information about the goals of the teaching unit (the enhancement of solving modelling
problems using multiple solutions vs. one solution)
Group work according to the fixed cooperation script. The cooperation script consisted of
three parts: (a) individual work: working individually and developing the first ideas about
how to solve a problem; (b) cooperative work: discussing ideas for solving the problem in
group work; (c) individual work: writing down one’s own individual solution or multiple
solutions (Schukajlow et al., 2012)
Presentation of information about how the first problem could be solved after the group
work. Multiple solutions (multiple-solution condition) or one solution (one-solution
condition) of other problems were presented by students and discussed by the whole class
A summary of the focal features of the modelling problems with or without multiple
solutions