This report documents the social based requirements for the adoption of the PHOENIX solution and subsequently, defines the project business use case. Within this context, this task examines the societal and individual behavioural factors that shape consumers’ intention to acquire a smart device or upgrade their building into a more connected and smarter one. The approach for eliciting the enabling and hindering factors is based on a social-psychological model, following the Theory of Planned Behaviour by Ajzen. The intention, norms and control of consumers’ behaviour are measured by means of a cross-sectorial survey, thus highlighting the different factors that may enable or block the upgrade of existing buildings. Based on an analysis of the survey outcomes as well as the input from the business, market and regulatory requirements, as identified in D2.1., a business use case for the PHOENIX innovations is presented.