Thermal analysis has developed into one of the most important testing methods in plastics engineering in recent years. In processing technology, product development, quality assurance, damage analysis, and service life prediction, thermal analysis methods are indispensable. This book presents the key methods of thermoanalysis from the perspective of users. The focus is on problem assignment and the interpretability of the methods. It covers the fundamentals and testing practices of various measurement techniques, including sample preparation, sample dimensions and weight, crucibles, type and height of loading, heating and cooling rates, selection of purge gases, start and end temperatures, as well as calibration. Practical examples are used to interpret the test results and correlate them with material parameters.