- AARRR Funnel
- A five-stage framework β Acquisition, Activation, Retention, Referral, Revenue β that maps the full customer lifecycle and identifies where growth experiments should focus.
- Growth Experiment
- A time-boxed, hypothesis-driven test designed to validate or invalidate a specific assumption about how to grow a measurable metric.
- North Star Metric
- The single metric that best captures the core value a product delivers to customers and that the entire growth team optimizes toward.
- Activation
- The moment a new user first experiences the core value of a product β the 'aha moment' β which strongly predicts whether they will return and pay.
- Viral Coefficient (K-factor)
- The average number of new users each existing user generates through referral or word of mouth; a K-factor above 1.0 means the product grows without paid spend.
- CAC (Customer Acquisition Cost)
- Total sales and marketing spend divided by the number of new customers acquired in the same period.
- Churn Rate
- The percentage of customers or revenue lost in a given period, typically measured monthly or annually.
- Product-Market Fit
- The degree to which a product satisfies a strong market demand β typically evidenced by a retention curve that flattens rather than declining to zero.
- Pirate Metrics
- An informal name for the AARRR framework, coined because the acronym sounds like a pirate's exclamation, widely attributed to Dave McClure of 500 Startups.
- ICE Score
- A prioritization method that ranks growth experiments by Impact, Confidence, and Ease on a 1β10 scale to decide which tests to run first.
- Retention Curve
- A graph showing the percentage of users still active at each time interval after sign-up; a flattening curve indicates the product has achieved sustainable retention.