There is a wide range of different stakeholders who may be affected by energy flexibility measures: end-users (occupants of buildings), building owners, facility managers, Energy Service Companies (ESCOs), developers, architects, contractors, and product/system suppliers. The energy flexibility is ultimately useful for aggregators, DSOs (Distribution System Operators), TSOs (Transmission System Operators), and district heating suppliers.This report establishes a comprehensive understanding of acceptance, behaviour, and motivation at different levels of involvement for the relevant stakeholders.@en