In the absence of uniform data sources and comparable characteristics, deduplication and matching of the data sources is required. This is implemented with the help of special distance functions to describe the similarity and correspondence of the data sets in combination with expert knowledge. While primarily descriptive presentations and simple statistics are used to answer the content-related questions, we will also focus on building suitable data models, exploring the contents and analyzing the data quality. If successful, it can be expected that the newly created methodology, proven procedures and data processes provide the foundation for further projects and can significantly improve the efficiency of decision support.