Again, John Hull has done a great job revising and updating this best-selling book. Changes in the fifth edition include:     A new chapter on credit derivatives (Chapter 21).  New! Business Snapshots highlight real-world situations and relevant issues.  The first six chapters have been -reorganized to better meet the needs of students and .instructors.  A new release of the Excel-based software, DerivaGem, is included with each text.     A useful Solutions Manual/Study Guide, which includes the worked-out answers to the "Questions and Problems" sections of each chapter, can be purchased separately (ISBN: 0-13-144570-7).