This is an updated version of Integer Programming by Laurence A. Wolsey, which covers techniques for modeling and solving Integer Programming problems. The book has been significantly updated and revised since the first edition's publication over twenty years ago. The chapters on Column Generation have been completely rewritten. The chapter on Heuristics has been significantly updated, as well as the final chapter on "From Theory to Solutions". In the final chapter, the use of modelling languages and MIP solvers are brought up-to-date. A few new applications are discussed in Chapters 12 and 14. Additionally, the major commercial use of Linear Programming-based solvers is now to solve mixed integer programs. Therefore, it is now important to have a relatively simple book at a level that industrial users can learn from and use to solve their specific MIP problems. This book fills that need. It is a great resource for scientifically oriented Master's students as well as industrial users who need to solve hard integer programs and/or develop programs of some of the basic algorithms