As the long-time best-seller, Garrison has helped guide close to 3 million students through managerial accounting since it was first published. It identifies the three functions managers must perfo r m within their o r ganizations—plan operations, control activities, a nd make decisions—a nd explains what accounting info r mation is necessary fo r these functions, how to collect it, a nd how to interpret it. Garrison’s Managerial Accounting, is known fo r its accuracy a nd rigo r . It is also unique in that the autho r s write the most impo r tant supplements that accompany the book: solutions manual, test bank, instructo r ’s manual, a nd study guide.