Diplomacy and international organisations

An organisation whose activities cross several jurisdictions does not freely choose where its data is processed. The framing of transfers and the traceability of access govern whether the arrangement is feasible at all, and they are settled before the architecture, not after.

The second feature of this environment is the heterogeneity of what already exists. A site in service for years carries systems installed ten years apart by different suppliers, with no common supervision and no documentation carried over. Taking over costs less than adding to it, provided the decision comes before the first replacement device is bought.

The third is continuity of activity. The site does not stop during the works. That imposes phases that stay reversible until their partial acceptance is pronounced, cutovers outside opening hours, and a temporary arrangement kept in parallel until each phase is validated.