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This special issue raises the prospect of trust-based determinants of security communities other than cultural similarity. The case studies in this special issue document the emergence of cross-border and transgovernmental policy and enforcement networks that facilitate policy development, implementation and alignment through coordination, cooperation, and collaboration: nascent communities coordinate, ascendant communities coordinate and cooperate but struggle to collaborate, while mature communities coordinate, cooperate, and collaborate. Specifically, pluralistic forms of communication and interactions away from the actual borderline seem to play a key role in the emergence of friendly and trustful relationships among border dyads that need not necessarily be contiguous.