#07B Implementation Architecture Positioning & Cross-Sector Category Trajectory Assessment of the TSSF–SIIL Framework Stack

This paper positions the implementation-coordination gap identified through the Tourism Sustainability Systems Framework (TSSF) within the wider institutional architecture of sustainability transition systems and evaluates whether responsibility for this coordination function is assigned to any existing actor class.
Building on the cross-sector transferability findings of Paper #07A, the analysis tests whether the missing coordination-layer position corresponds to an unrecognised institutional responsibility boundary rather than a programme-design limitation or sector-specific implementation constraint. The results confirm that no existing actor type within tourism sustainability implementation environments holds ecosystem-scale responsibility for structured implementation coordination across policy instruments, certification pathways, workforce preparation systems, and operator-level deployment environments.
This responsibility-boundary absence establishes the analytical trajectory toward defining a distinct implementation-infrastructure coordination layer and prepares the empirical foundation for the cross-actor institutional ownership validation performed in Paper #08.