By Nir Eyal
Building products that form habits
Subject
Themes
Seventy-nine percent of smartphone owners check their devices within fifteen minutes of waking. People reach for their phones an estimated 150 times daily, often without conscious awareness. These compulsive behaviours follow predictable patterns that companies can deliberately engineer through a four-phase process called the Hook Model.
Seventy-nine percent of smartphone owners check their devices within fifteen minutes of waking. People reach for their phones an estimated 150 times daily, often without conscious awareness. These compulsive behaviours follow predictable patterns that companies can deliberately engineer through a…
Published in 2014, this work arrived at a moment when Silicon Valley's relationship with behavioural psychology was intensifying rapidly. The smartphone had become ubiquitous; Facebook had surpassed one billion users; and the attention economy was emerging as a dominant business paradigm. The…
The distinction between wanting and liking sits at the heart of how habit-forming products capture attention. For decades, researchers assumed the nucleus accumbens was the brain's pleasure centre. James Olds and Peter Milner's experiments in the 1940s seemed to confirm this: mice with electrodes…
The most powerful lever in product design is not motivation but ability. When designers must choose between making users want something more intensely or making it easier for them to do it, the answer is consistently to reduce friction. This principle, drawn from BJ Fogg's Behavior Model (B = MAT),…
The power to form habits raises a question the technology industry has largely avoided: when does persuasion become exploitation? The Manipulation Matrix offers a framework for answering this, but the tensions it reveals run deeper than any two-by-two grid can capture. Manipulation, defined as an…
The investment phase of the Hook Model creates what traditional economics would call switching costs, but the mechanism operates through psychology rather than contracts or prices. Five forms of stored value accumulate within habit-forming products, each raising the barrier to departure in distinct…
The transition from external to internal triggers represents the most critical inflection point in habit formation. External triggers (notifications, emails, advertisements) can bring users to a product, but they are expensive to maintain and fundamentally unreliable. Internal triggers, the…
The Hook Model provides a structured framework for understanding how products create habits through four sequential phases: trigger, action, variable reward, and investment. Each phase builds upon the last, forming a self-reinforcing cycle that transforms occasional product use into an automatic,…
An evening jog exposes the invisible machinery of habit. When a morning runner shifts to an evening schedule, automatic behaviours spill out unbidden: greeting strangers with "Good morning" despite the dusk, then lathering up and shaving after a shower because the post-run routine has been…
Yin, a Stanford student in her mid-twenties, snaps and posts dozens of Instagram photos daily without realising she is hooked. "I just use it whenever I see something cool," she says. "I feel I need to grab it before it's gone." Purchased by Facebook for one billion dollars in 2012, Instagram…
Dr. BJ Fogg, Director of the Persuasive Technology Lab at Stanford University, distilled human behaviour into a deceptively simple formula: B = MAT. Behaviour occurs only when motivation, ability, and a trigger converge simultaneously and in sufficient degrees. If any component is missing or…
In the 1940s, researchers James Olds and Peter Milner implanted electrodes in lab mice that allowed the animals to stimulate their own nucleus accumbens. The mice became so hooked they forewent food, water, and endured painful electrified grids to keep pressing the lever. Human subjects behaved…
Three psychological tendencies make the Investment Phase extraordinarily powerful. The first is an irrational overvaluation of personal effort, demonstrated in a 2011 study by Dan Ariely, Michael Norton, and Daniel Mochon. University students who folded origami cranes or frogs were asked to bid on…
Five fundamental questions now frame the complete Hook Model. What pain does the product relieve? What brings users to the service? What is the simplest action users take in anticipation of reward? Are users fulfilled by the reward yet left wanting more? What bit of work do users invest, and does it…
A user walked into a strip club and received a Bible verse notification on his phone. "God's trying to tell me something!" he exclaimed. "I just walked into a strip club, and man, the Bible just texted me!" Bobby Gruenewald, CEO of YouVersion, recounts this story with evident delight. By July 2013,…
Building a habit-forming product is an iterative process requiring user behaviour analysis and continuous experimentation. Habit Testing, inspired by the lean startup movement's build-measure-learn methodology, distils this process into three practical steps: identify, codify, and modify. The first…
By Nir Eyal
Subject
Themes
Seventy-nine percent of smartphone owners check their devices within fifteen minutes of waking. People reach for their phones an estimated 150 times daily, often without conscious awareness. These compulsive behaviours follow predictable patterns that companies can deliberately engineer through a four-phase process called the Hook Model.