In this book, I explain the basic theory and calculation programs for using various operations research (OR) techniques with Mathematica.This book not only gives you a general view of OR, but also allows you to use your notebook to perform actual calculations. Therefore, it can be used for calculation of various university subjects and graduation research, so if you are in an environment where you can use Mathematica at a university, I would like you to use it. I also believe that it will be the basis for those who are aiming for a Master of Business Administration (MB A) and those who perform big data analysis.I have confirmed the operation with Mathematica Ver.12.The contents of the book are as follows.table of 1 Introduction to Mathematica and a Simple Usage ExampleChapter 2 Probability and StatisticsChapter 3 SimulationChapter 4 Demand ForecastChapter 5 Differential Equation ModelChapter 6 Inventory ManagementChapter 7 Queue TheoryChapter 8 Linear ProgrammingChapter 9 Dynamic ProgrammingChapter 10 Game TheoryChapter 11 Decision TheoryChapter 12 Visualization of calculation results