This book was not designed to be read from cover to cover. At the core of the book are seventeen diagnostic flowcharts, and the sole purpose of the text is to expand upon them. The flowcharts themselves are necessarily written in short-hand form, to fit a meaningful number of decision points on a page. A linear text is simply not possible due to the decision tree structure of the flowcharts. The diamond shape for each decision point in the flowchart is repeated in the outer margin of the following pages. This marks the section of text that explains the action in more detail. Do not read beyond the designated section without returning to the flowchart to determine the next step.