Comparative social science research requires comparable data across countries. This CESSDA webinar explores sources of harmonised comparative data and methods and tools for harmonising data. Hosted by Jen Buckley from the UK Data Service, the session includes two expert speakers. Professor Irina Tomescu-Dubrow discusses methodology that the Survey Data Recycling Project develops to harmonize ex-post data pooled from cross-national survey projects in the social sciences. Then, Dr Kristi Winters addresses how we should approach documenting data harmonisation work, including a description of CharmStats , an open-source software that enables researchers to simultaneously perform and document the process of variable coding and harmonization. About the Speakers: Irina Tomescu-Dubrow is Professor of Sociology at the Institute of Philosophy and Sociology, Polish Academy of Sciences. https://irinatomescudubrow.wordpress.com/ Dr Kristi Winters works at the Department of Data Archive for the Social Sciences, GESIS - Leibniz-Institute for the Social Sciences. Target audience: researchers interested in comparative/cross-national research (with a primary interest in European survey data). Note: This video will be available for viewing on Youtube.