The "accurate handling" of mathematical methods and models, which is so important and ubiquitous in today's professional life, requires that students know and understand the relevant tools, select and apply them, and check, evaluate, and transfer the results (for plausibility) to other questions or use them for problem-solving as needed. Based on school mathematics, the authors convey these job-relevant skills to the reader in a didactically excellent and accessible manner. Each chapter is equipped with an introductory and a concluding test, alongside many exercises with solutions, to enable efficient learning control.