This workbook was written by professionals for professionals. It is not a classic textbook. Achim Höcherl, an experienced trainer and expert, developed "Fit in Wastewater Technology" based on his idea of the Modular Wastewater Training System. The aim of the tasks is - as with the Modular Training System - to achieve holistic learning. That means learning with all senses - with head, heart and hand. That way success comes faster and it stays. This workbook is aimed at both trainers and trainees on their way to becoming a wastewater engineering technician. As an instructor, you will receive valuable help to prepare your trainees for exams and practice. You will get ideas for a lively design of the in-house lessons and for an effective use of the Modular Wastewater Training System. As a trainee, you get a good feeling for what you already know and what you have to practice again. You will become more familiar with "your" wastewater treatment plant and - hopefully - have more fun learning for the exam and for your professional life.