Product Metrics: North Star, HEART and AARRR
A good product metric drives decisions: the North Star summarizes delivered value in one number, input metrics are levers teams can move weekly, guardrails catch the side effects of optimization. We build a metric tree for Bookstore, measure guest checkout with HEART and Goals-Signals-Metrics and the customer lifecycle with AARRR, and discuss leading versus lagging and vanity metrics.
8 Nov 2026
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8 min
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5
