Vonk and Geertman diagnose a persistent mismatch between the supply of planning support systems and their actual use in practice. The important proposition is not simply that planners underuse technology, but that tools fail when technical development is detached from the situated demands, capacities and learning processes of planning organisations. Their methodological operation is bottleneck analysis: they classify obstacles on supply and demand sides and use these frictions to reverse the usual technology-first perspective. Planning support systems are understood as information frameworks that can provide, communicate and analyse knowledge, yet their epistemic value depends on organisational fit, demonstrable usefulness and iterative learning between developers and users. The paper bridges GIScience, planning support research and professional practice. It matters to the shared nexus because it makes mediation visible. Evidence does not become operational merely by being mapped, modelled or visualised; it must be formatted for actual tasks, interpreted within institutional routines and retained through use. The source therefore anticipates a broader principle: every planning interface is also a filter governing which possible futures become practically examinable.
URBANISM MEETS ART