Metric
Trigger-to-session conversion
Share of external triggers sent (push, email, in-app) that lead to a session within the attribution window. The measured evidence for the External trigger link.
Return
Plain label: share of prompts that lead to a sessionAlso known as: notification conversion, prompt open rate
Read it per trigger type and against a holdout: a high open rate on a prompt that would have been a natural visit anyway proves little.
Sources
Book content is paraphrased, never quoted at length. Last verified October 24, 2026.
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