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referral-program-design

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Design a referral or viral-loop program that actually drives growth. Use when asked to design a referral program, build a viral/invite loop, set referral incentives, or improve word-of-mouth growth. Produces a referral design — the loop mechanics, incentive structure (who gets what, when), the viral-math estimate (k-factor/cycle time), fraud guardrails, placement & messaging, and success metrics.

plugins/pm-growth/skills/referral-program-design/SKILL.md

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# Referral Program Design Skill

A referral program is a growth loop, not a coupon. It only compounds if each new user invites more than
they cost and the cycle is fast. This skill designs the mechanics and incentives, then sanity-checks them
with the viral math — because most referral programs fail not on creativity but on a k-factor below 1.

## Required Inputs

Ask for these only if they aren't already provided:

- **Why users would share** — the genuine reason (status, mutual benefit, the product is better with others).
- **Economics** — the value of a new customer (so the incentive budget is grounded) and current organic word-of-mouth.
- **The moment of delight** — when users are happiest (the best time to ask for a referral).
- **Goal** — what the program must do (lower CAC, accelerate growth) and over what horizon.
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