Example Variation Problems build in difficulty by changing scenarios, changing the knowns vs. unknowns, and adding complexity and a step of reasoning to provide the most helpful range of related problems that use the same basic approach to find their solutions. These scaffolded problem sets help students see patterns and make connections between problems that can be solved using similar steps and help them to be less surprised by variations on problems when exam time comes. Assignable in Mastering Physics. Learning Outcomes succinctly state goals for each chapter, identifying for students what they should be learning and aiding in metacognition. Each end-of-chapter problem is correlated with one or more learning outcomes. Learning Outcomes Table at the start of each end-of-chapter problem set relates problems and helps students target what they don’t know and prove what they do.