It is now a third of a century since the 1967 publication of the first edition of the pathbreaking Introduction to Operations Research, when the field was still relatively new. A great deal has changed since then in regard to both developments in the field and evolving pedagogical demands of students. The seventh edition, in both regards, brings the book fully into the twenty-first century. This new package contains version 2.0 of the CD-ROM, in which all of the software has been updated.