This anthology is a unique compilation of scientific contributions on the topic of measurement and understanding, showing how terms such as number, measurement, understanding, model, pattern are used in a wide variety of disciplines. Based on the results and experiences from their own projects, 23 researchers comment on the potentials and limitations of individual methodological approaches and success factors of interdisciplinary collaboration. In doing so, they sound out the different significance of quantification and empirical evidence for their own disciplines and examine the influence of methodological approaches on existing models and images. The common goal is to want to understand the world; the methods, however, are highly diverse.