This document discusses the BYTE project which aims to address societal externalities associated with big data use. The project will produce a research roadmap and recommendations, involve relevant stakeholders to identify challenges through case studies, and disseminate findings. Case studies will explore externalities in various domains including environmental, energy, and health data. Both positive externalities like efficiencies and innovation, and negative externalities like privacy concerns and outdated legislation are discussed. Health case studies found improvements in diagnosis and treatment but also reluctance to share data due to legal and ethical constraints.