Rubric for measuring student performance on Step 3 of the PSM

Dr. Nikos J. Mourtos

Score	Performance Criterion:  Select an appropriate model (theoretical or empirical) for developing a solution,  break down the problem into sub-problems (stepping-stones), and determine what needs to be found in each sub-problem. Draw free-body diagrams / control volumes as necessary. Write down all equations necessary for the solution
10	Select the most appropriate model for developing a solution, break down the problem into appropriate sub-problems; complete list of what needs to be found in each sub-problem. Free-body diagrams / control volumes are correct and include all the forces.  All pertinent equations are written down correctly as they apply for the particular problem.
7 - 9	Select an appropriate model for developing a solution,  break down the problem into appropriate sub-problems;  incomplete list of what needs to be found in each sub-problem. Free-body diagrams / control volumes have a couple of errors; a force has been left out.  All pertinent equations are written down but may have small omissions / errors.
5 - 6	Selected model for developing a solution is not described adequately; break down of problem into sub-problems is not appropriate or helpful; list of what needs to be found is incomplete.
1 - 4	Did not identify a model for developing a solution or did not break down the problem into sub-problems and / or did not list what needs to be found.
0	Did not attempt.