Principlev1
Use the completion of an anchor behavior (the trailing edge)
Use the completion of an anchor behavior (the trailing edge) rather than the behavior itself as the cue, because completions are discrete temporal events that provide sharp triggers for pattern-matching systems.
Why This Is a Principle
This principle derives from Habits as Context-Response Associations (habit formation in stable contexts), The completion of one action can serve as a discriminative (completion of one action cues the next), and Experience Segments into Nested Hierarchical Events (the brain segments experience into events with boundaries). It prescribes using completion moments rather than durations, which is a derived design insight, not a foundational truth.