The third edition of the SUMP Guidelines defines sustainable urban mobility planning as an iterative civic process rather than a transport-engineering document. Its iconic idea is procedural: mobility planning becomes a cycle of preparation, analysis, strategy, measure selection, implementation, monitoring, adaptation and learning. The theoretical contribution is to translate sustainability into governance choreography, where indicators, stakeholders, finance, adoption, scenarios and communication are embedded within a single planning apparatus. Methodologically, the guidelines operate as a stepwise institutional protocol, moving from working structures and planning frameworks to scenario assessment, objective formation, target-setting, measure packages and evaluation. Its bridge to planning theory is substantial because it formalises participation, monitoring and policy learning as technical requirements, not optional democratic ornaments. The city becomes a managed field of feedback, where plans are valuable only insofar as they remain revisable, accountable and connected to implementation.