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In precedence diagramming, Start-to-Finish (SF) indicates a successor cannot finish until the predecessor starts. It’s the least-used relationship but accurately models handover scenarios such as shift changes or cutover support where the outgoing activity (successor) must remain active until the incoming activity (predecessor) has begun. In this case, the night-shift operator’s duty (successor) ends only after the day-shift operator starts (predecessor). By contrast, Finish-to-Start (FS) requires the successor to start after the predecessor finishes—typical for sequential tasks like “build then test,” but the situation here hinges on the start of the next shift, not the finish of the first. Start-to-Start (SS) aligns starts of two activities (useful for concurrent ramp-up) and wouldn’t prevent the night shift from ending before day shift begins. Finish-to-Finish (FF) ties finishes together and is more appropriate when two activities must complete at roughly the same time, such as testing and documentation. Correctly selecting SF preserves operational safety and service continuity by ensuring overlap at the transition point. CAPM scheduling emphasizes choosing the smallest, clearest relationship that reflects real constraints, documenting any leads/lags, and analyzing risk due to overlaps, especially for human-intensive handoffs.