Video on Harmonised Datasets: This video introduces the I4NG Harmonised Datasets produced as part of the Infra4NextGen project, which is funded by the European Commission to support evidence-based policymaking aligned with the NextGenerationEU plan. It was created to help researchers understand and make full use of the harmonised data. The video explains how data harmonisation increases comparability and expands the possibilities for cross-national research. It also discusses the advantages and key limitations of ex-post harmonised data to help researchers understand when and how these datasets are appropriate for their analysis.