Digital competence is a crucial catalyst for cities aiming to transition towards sustainability and climate neutrality. However, many cities lack a clear understanding of their current digital capacity or the maturity of their digital infrastructure, which hinders their ability to identify and enhance underdeveloped aspects of their ecosystem. To address this deficiency, a qualitative framework has been developed to assess the digital maturity levels of cities. Specifically, this document describes the development of the DISCO project’s Digital Transition Assessment tool.