Make a plan (plan). After making a scientific description, students are asked to
make a solution plan individually. This plan should involve the steps in the equations
and rough estimates of the outcome. Then they are asked to put their plans together
to compare. It is not necessary that there must be consent or one must follow the
other’s plan. Comparison of the solution plan simply makes students aware that more
than one solution is possible. They may use the hint to check whether they are on the
right track or they may correct their solution plans if necessary.