The first part of the document describes shortly the overall stakeholder engagement strategyand builds on report D2.1. It gives an overview of different stakeholder groups and how theirspecific needs and feedback are collected for different aspects of the OEMC project.The second part of the document describes the methods of the stakeholder need andrequirement assessment based on an online survey and targeted interviews. The final results ofthe online survey will be presented and an interview guide for the targeted survey of use-caserequirements for OEMC products and services will be presented.This is the final version of the report on “User requirements and data gaps” showing the ongoingand future activities. The outputs of the described activities are relevant for the tasks in WP3—6as the stakeholder needs and feedback will have an impact on the design of particularfunctionalities of the OEMC computing engine (WP3), preparation and dissemination of thein-situ data (WP4), and especially on the EU and world monitors (WP5 and WP6) as well as onthe 32 OEMC use cases.