MENTAL MODEL · M3641

Pirate Metrics

BusinessmediumEntrepreneurship

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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

A growth framework introduced by Dave McClure and named for the initials AARRR. Its core proposition is that a product's growth decomposes into five measurable stages, acquisition of visitors, activation to a first meaningful experience, retention of returning use, revenue generation, and referral by satisfied users, and that diagnosing which stage leaks most is more useful than optimizing the whole funnel at once. The key constraint is that the stages must be defined concretely for the specific product; generic definitions produce metrics that look comparable across companies but do not drive decisions.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Bottleneck location: measure all five stages and fix the one with the largest drop rather than the most visible one. - Metric definition: specify one concrete event per stage before collecting data. - Loop check: treat retention and referral as the stages that determine whether acquisition spending compounds.

anchor

Anchor fast decisions

Growth is multiplicative across the funnel, so the overall rate is governed by the weakest stage: improving a stage that is already strong yields little, while a small gain at the worst stage multiplies through every later one. Naming the stages separately also prevents the common error of reading acquisition as growth, since a funnel that leaks at retention converts traffic into churn rather than into a compounding base. The framework works by making the multiplicative structure visible.

MINIMUM ACTION

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Practice this model in one real situation:

Define one concrete event for each of the five stages in your product. 2. Instrument the funnel so each stage can be counted over the same period. 3. Compute the drop between consecutive stages and identify the largest. 4. Fix that stage first and re-measure before touching any other. 5. Check retention and referral separately, since they determine whether acquisition spending compounds.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

link
amplitude.comhttps://amplitude.com/en-us/blog/pirate-metrics-frameworkZH · Explicit
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