Th e instructional design includes student-focused learning tools to help students succeed. Th is visual guide highlights the features designed for the textbook. Cautions alert you to practices that could potentially damage equipment or instruments. Guided Tour Warnings alert you to potentially dangerous materials and practices. Notes provide supplemental technical and service hints related to the procedure or system being explained. Learning Objectives clearly identify the knowledge and skills to be obtained when the chapter is completed. Technical Terms list the key terms to be learned in the chapter.