GUIDED TOUR Chapter Outline provides a preview of the chapter topics and serves as a review tool. 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. Illustrations have been designed to clearly and simply show concepts, processes, and equipment in support of the text material. Safety Notes alert you to potentially dangerous practices and hazards. Cautions alert you to practices that could potentially damage equipment or instruments.