Dr. Kristi Winters (GESIS) and Janek Bruker (formerly of GESIS) introduce the main aspects concerning social science variable harmonization and harmonized data documentation practices. Topics include: an introduction to social science variable harmonization, ex ante and ex post harmonization strategies, examples from international social science surveys (including the European Values Survey), the use of international standard classifications, and how to use metadata to construct FAIR variable harmonization documentation. This course was created for the Consortium of European Social Science Archives (CESSDA). The course material comprises also a series of four videos: 1. An Overview of Concepts and Strategies http://doi.org/10.5281/zenodo.3924208 (This video is also available for viewing on Youtube) 2. Process, Challenges and Quality Criteria http://doi.org/10.5281/zenodo.3924218 (This video is also available for viewing on Youtube) 3. International Standard Classification http://doi.org/10.5281/zenodo.3924227 (This video is also available for viewing on Youtube) 4. Documentation and Best Management Practices http://doi.org/10.5281/zenodo.3924241 (This video is also available for viewing on Youtube)