Book profile

Hacking Growth: How Today's Fastest-Growing Companies Drive Breakout Success

Sean Ellis, Morgan Brown

Hacking Growth lays out a cross-functional, data-driven, rapid-experimentation methodology that today's fastest-growing companies use to systematically acquire, activate, retain, and monetize customers.

Written by Sean Ellis, who coined the term 'growth hacking,' and expert practitioner Morgan Brown, Hacking Growth is the definitive, step-by-step playbook for driving breakout business growth. Drawing on case studies from Dropbox, Facebook, Airbnb, Uber, Pinterest, LinkedIn, and many others, the book argues that breakout growth is not the result of a single lucky 'lightning in a bottle' idea, but rather of a disciplined process of high-tempo, cross-functional experimentation. It shows how to build a growth team that unites marketing, engineering, product, and data analytics; how to determine whether your product is truly 'must-have' before pushing for growth; how to identify your key growth levers and North Star metric; and how to run rapid-fire experiments across the full customer funnel. With concrete playbooks for acquisition, activation, retention, and monetization, plus tools for prioritizing and tracking experiments, the book gives any team or company a rigorous, repeatable engine for sustainable growth.

The model

A causal model in which design levers (cross-functional growth team, high-tempo experimentation, data instrumentation) act on psychological and behavioral states across the customer funnel (must-have product value, aha moment activation, habit formation) to drive outcome metrics (acquisition, activation, retention, monetization, and ultimately sustainable revenue growth). Friction and channel/language fit moderate conversion at each stage.

Frameworks you can use

Love creates growth, not the other way around: build a must-have product first.
The companies that learn the fastest grow the fastest; volume and tempo of experiments matter.
Big successes come from a series of small wins compounded over time.
Decisions should be driven by hard data and rigorous experiments, not lore, assumptions, or opinion.
Focus efforts on high-impact experiments and a North Star metric rather than vanity metrics.
Break down departmental silos through cross-functional collaboration.

Key terms

Cross-Functional Growth Team: A team uniting product, engineering, marketing, data, and design expertise under a growth lead with executive backing to collaboratively pursue growth.
High-Tempo Experimentation: The disciplined, continuous cycle of analyzing, ideating, prioritizing, and testing growth ideas at a high sustainable pace.
Data Instrumentation and Analytics: The capability to track, pool, and analyze customer data across the funnel to generate insights and evaluate experiments.
Must-Have Product Value: The degree to which customers regard a product as indispensable, reflecting achieved product/market fit and core value.
Aha Moment Activation: The moment a new user first experiences the core value of a product, marking activation.
Channel and Language Fit: The combined fit of marketing messaging to the audience and of marketing channels to the product and audience.
Funnel Friction: Hindrances that impede users from completing desired actions on the path to value.
Habit Formation and Engagement Loop: The development of routine, self-triggered product use through engagement loops and stored value.