Motivation, Ability, Trigger Behavior Model
Diagnose behavior by checking desire, ease, and the cue to act
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 4
- Confidence
- 94%
This behavior model treats action as the result of three conditions: motivation, ability, and a trigger. Motivation is how strongly a person wants to act. Ability is their capacity to act, which increases as the behavior becomes physically, mentally, temporally, and financially easier. The trigger is the cue that prompts action. Product teams can use the model as a diagnostic rather than assuming users simply lack desire. If a motivated user sees the right cue but still does not act, inspect the environment for friction: slow loading, crowded screens, unclear choices, excessive cost, or insufficient trust. Improve the easiest variable first, then observe whether completion rises. The mechanism also explains why readily available options often beat healthier or more valuable alternatives that require extra effort.
Origin
Nir Eyal attributes the motivation, ability, and trigger formulation to BJ Fogg's work at Stanford and connects it to the older principle that behavior reflects both person and environment.
Core principles
- 01Behavior depends on both the person and the environment
- 02Motivation supplies the energy for action
- 03Ability rises as a behavior becomes easier
- 04A trigger must prompt the behavior at the right moment
How to run it
- 1
Define the behavior
State one observable action the user should take. Avoid vague outcomes that cannot be diagnosed.
Pro tip Use a verb and a visible completion point.
- 2
Check motivation
Determine whether the user wants the result and whether that desire is present when the action is requested.
Pro tip Look for an existing internal need rather than trying to manufacture one.
Watch out Ease cannot make an unwanted behavior ethically desirable.
- 3
Increase ability
Reduce the physical, mental, time, and monetary effort required. Remove the largest barrier before adding more persuasion.
Pro tip Test small friction changes such as load time, screen density, and trust cues.
Watch out Do not interpret confusion as low motivation.
- 4
Place the trigger
Provide a clear cue when the user is motivated and able to act. The prompt should make the next step obvious.
Pro tip Time the cue to the moment the relevant need occurs.
Watch out More prompts will not compensate for low ability.
In the wild
A person in a rush sees a ready-to-eat doughnut on the kitchen counter while eggs require opening the fridge and cooking. The environment makes the doughnut easier, so it wins despite the healthier intention.
→ Lower friction makes the immediately available behavior more likely.
A motivated customer reaches a slow, crowded page with competing prompts and weak trust signals. Simplifying the interface, shortening load time, and clarifying the next action increase ability without requiring stronger motivation.
→ Removing environmental friction raises the likelihood of completion.
Common mistakes
Blaming motivation first
Users may want the outcome but be blocked by friction. Inspect ability and the environment before demanding more desire.
Adding triggers to a hard action
Repeated reminders do not solve excessive effort, confusion, cost, or mistrust. Make the behavior easier first.
Is it for you?
Best for
It is best for diagnosing onboarding, conversion, and recurring actions in useful products.
Not ideal for
It is not ideal when the proposed behavior does not genuinely benefit the user or lacks sufficient motivation.
From the transcript
“behavior is a function of motivation ability and a trigger”
“motivation is the energy for action how much we want to do something and ability is how easy it is to do that behavior”
“the easier something is to do the more likely we are to do it”
From the episode
YAPClassic: Nir Eyal on Being Indistractable
YAPClassic