Who should be included in collaborative governance and how they should be included is an important topic, though the dynamics of inclusion are not yet well understood. We propose a conceptual model to shape the empirical analysis of what contributes to inclusion in collaborative processes. We propose that incentives, mutual interdependence and trust are important preconditions of inclusion, but that active inclusion management also matters a great deal. We also hypothesize that inclusion is strategic, with 'selective activation' of participants depending on functional and pragmatic choices. Drawing on cases from the Collaborative Governance Case Databank, we used a mixed method approach to analyse our model. We found support for the model, and particularly for the central importance of active inclusion management.

Conventional urban drainage approaches have historically focused on the volume of stormwater to be displaced with the aim of moving it as fast and as far as possible from the city. They have also been negligent regarding water quality and the inherent value of watercourses to distinct forms of life in cities, from maintaining biodiversity to providing recreational space for residents. Contemporary responses to these issues point to a paradigm change: They seek to replicate the natural mechanisms of absorption and retention, with the aim of addressing pluvial drainage needs closer to the site of origin. This article aims to explore the extent to which such an approach could be accommodated in one dense and highly impervious setting in the Global South. Specifically, it compares urban morphology, land value, hydraulic performance, and politico-institutional conditions of grey and Blue-Green Infrastructure (BGI) scenarios in Buenos Aires, Argentina. The findings suggest that even in very dense and impervious urban basins it is possible to implement BGI with a significant effect in achieving urban-sustainability goals. Furthermore, the results demonstrate that it is possible to deculvert watercourses in line with Compact City principles through the development of hybrid BGI/grey-infrastructure systems.

This special issue brings together new case studies and comparative works highlighting the drivers and dynamics of collaborative environmental governance. Each case is part of the Collaborative Governance Case Database, which is an open-access resource allowing individuals to contribute and access cases to support research projects. This article highlights the special issue’s contributions to collaborative governance theory. Common themes that cut across the studies include: the importance of using a broad definition of collaborative governance to capture the diversity in interorganizational relationships across contexts; improving our understanding of the drivers for initiating collaborative governance; an enhanced understanding collaboration’s lifecycle dynamics and developmental trajectories; the importance of individuals and their roles in collaborative processes; the political dynamics of collaboration; the role of accountability; and the challenges associated with assessing the performance of collaborations. Collectively, the cases also demonstrate the value of using resources such as the Collaborative Governance Case Database to undertake small-n and medium-n comparative studies that further theory building.

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