The distinctiveness of an operational transdisciplinary field lies less in possessing unique subject matter than in selecting a particular unit of analysis: the mechanism that travels across disciplinary regimes while producing identifiable transformations. This places it close to Science and Technology Studies, systems thinking, urban studies, environmental humanities, design research, artistic research, critical theory and information studies without making it reducible to any of them. STS provides indispensable accounts of classifications, infrastructures and sociotechnical production, but the present framework systematically follows operations beyond science and technology into architecture, environmental psychology, art, ecology, pedagogy and publication. Systems thinking contributes feedback, recursion and emergence, while the operational approach resists turning “system” into a universal explanation by requiring a material substrate, scale and demonstrable consequence. Urban studies offers a privileged environment in which property, infrastructure, ecology and behaviour intersect, yet urban space remains one testing ground rather than the total object. Environmental humanities provides relational and more-than-human thought, while this field couples those perspectives to behavioural evidence, spatial organisation, systems and archival infrastructure. Design and artistic research contribute intervention, framing and situated experimentation, although many of the relevant objects here—a metadata standard, citation chain or institutional classification—are not designed artefacts. The field therefore makes no claim to invent relationality, systems, situated knowledge or infrastructural critique. Its contribution lies in organising these genealogies through a common demand for operational specificity. Its boundary is pragmatic: when one discipline can explain a phenomenon adequately, transdisciplinary translation adds little; the framework becomes necessary when transitions among several regimes are themselves part of the mechanism requiring explanation.
