The investigation on the relationships between digital technologies and the city is more and more acknowledged as a research challenge among Information Systems researchers. As part of an Action Design Research project aiming at the development of a Capability Maturity Framework for Sustainable Connected Cities, this research in progress paper presents a systematic analysis of digitally-enabled services in this context. A taxonomy of services that have a potential positive impact on cities’ socio-economical and environmental sustainability is proposed. The KJ (Kawakita Jiro) method, which ingrains Grounded Theory’s and Affinity Diagrams’ principles, was applied to reach this scope. This project is being conducted by a consortium that involves representatives from academia, industry, and public authority.