The PALOMERA deliverable 5.3 Validation Report is an overview of the validation process used within the project to manage the validation of the project’s Key Exploitable Results (Knowledge Base, data analysis and recommendations) with a variety of relevant stakeholders across the diverse countries of the European Research Area and beyond. The validation exercises used several review and validation means (online annotation tools, review-a-thons, workshops and similar) and happened three times during the project. This deliverable reports the work carried out in all the validation exercises. Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the Agency. Neither the European Union nor the granting authority can be held responsible for them.