That demonstrate the appropriate use of the new fifth edition of the "Guides to Evaluation of Permanent Impairment. The distinguishing feature of this second edition is that it draws on the knowledge base of the fourth edition of the "Guides, by demonstrating through examples, differences between the "Guides fourth and fifth edition, New cases offer entirely new content unique to the "Guides Fifth and provides the basis for understanding new issues that examiners encounter. The clinician can evaluate theses cases and compare his or her assessment to that of the experts who discuss how they evaluated each case.