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As part of the Future Arrangements for Systems Services design and implementation, the TSOs are publishing the TSOs' Phased Implementation Roadmap as requested by the SEM Committee (SEM-23-103). This document presents a condensed overview of the programme in both a Level 1 and Level 2 format. Level 1 outlines the overarching plan for the 2024 – 2026 period, while Level 2 provides a detailed view of the 2024 plan. Further information on the scope and approach is provided in the Phased Implementation Roadmap.