The OM Explorer and POM for Windows software is available to all students using the 12th edition of this textbook. Go to http://www.pearsonhighered.com/krajewski to download these computer packages. If you purchased MyLab Operations Management, you also have access to Active Models software and significant help in doing the following problems. Check with your instructor on how best to use these resources. In many cases, the instructor wants you to understand how to do the calculations by hand. At the least, the software provides a check on your calculations. When calculations are particularly complex and the goal is interpreting the results in making decisions, the software entirely replaces the manual calculations.