In the framework of the WHY, PARITY, SMARTLIVINGEPC and ATELIER H2020 projects, an hybrid-multidisciplinary workshop session is organized to better understand which are the most predominant factors that affect decision-making in households regarding investment decisions on energy efficiency actions, installation of distributed generation, electrification of services, etc. 30 experts from all over Europe will work together to define a set of end-user archetypes of behaviors towards these investment decisions and the creation of a set of models following well used psychological theories.