摘要：Urban transformation towards sustainability requires deep systemic change in economic, social, environmental, cultural, organisational, governmental, and physical terms. Considering this challenge, this paper aims to explore the potentials and limitations of urban planning to incorporate an urban transition management approach that strives to enable such deep transformation processes. Taking the Integrated Sustainable Urban Development (ISUD) Strategy for district regeneration in Valencia (Spain) as a case study, the analysis and discussion elaborate on the main barriers and enablers for urban planning to incorporate a transition perspective when tackling urban sustainability challenges. Four main fields of tension emerge as particularly relevant: 1) Democratic representation versus involvement of forerunner innovators, 2) Formal decision-making procedures versus reflexivity and social learning, 3) Standardised project formats versus open processes of searching and experimentation, and 4) Fragmented policy agendas and budget lines versus integrated and multi-sectoral interventions. The case study illustrates how urban planning struggles to align its rationale with requirements for managing complex sustainability transformations. The findings point to a paradox inherent in planning for transformation: although urban planning necessarily incorporates the values and rules of the currently dominant urban systems, it also has the potential to create windows of opportunity for niche innovations to emerge at district or even city level. Therefore, urban planning processes form an arena in which conflicts between niches and regimes are negotiated.
