Whereas the “strategy-writing” desc

Whereas the “strategy-writing” described above [8] follows the structure of Principle-Justification-Procedure, the revised CPS approach uses Principle-Justification-Plan where the third step involves a numbered plan sequence outlining specifically how the principle will be applied to the problem.

In addition, the strategy is followed by a solution formatted as two columns: a left column that restates the plan step, and a right column that shows mathematical equations. The authors developed a bank of sample problems, strategies, and two-column solutions the teachers could choose from. There were typically 8-10 problems written for each physics topic. Teachers also had the option to use their own materials but structure them in the CPS format. The following text is an example of a problem with the corresponding written strategy