You can use the Build-A-Body: Digestive System simulation as both a pre- and post-assessment tool. Have students explore the simulation prior to your unit of instruction on the digestive system to build background knowledge. You can then project the simulation for the class to see during your instruction to illustrate your points and help students recall what they have learned. When your unit is finished, have students complete the simulation independently. You can evaluate the results in conjunction with students’ scores on the game quiz.