Fogg Behavior Model

What is the Fogg Behavior Model?

The Fogg Behavior Model is BJ Fogg's framework for describing whether a behavior occurs. Its current formulation is B=MAP: motivation, ability and a prompt come together at the moment of action. Earlier versions used “trigger” instead of “prompt,” giving the earlier shorthand B=MAT.

The three components

The official model description organizes the question around:

• Motivation: does the person want to act?
• Ability: how easy or difficult is the behavior for them?
• Prompt: what cues them to act at that moment?

Ability, simplicity, and the action line

Ability and simplicity

In Fogg’s description of ability, ease depends on the person’s constraints at that moment. A short form can still be difficult if the person has no time, cannot afford a required payment, or must expend substantial mental effort to understand the questions. Tools, resources, or a smaller requested action may make the behavior easier. This is a claim within the design framework, not a fixed measure of someone’s capabilities.

The action line

The official diagram plots motivation vertically and ability horizontally, from hard to easy. Its curved action line separates combinations where a prompt is expected to succeed from those where it is expected to fail. The model depicts higher motivation as allowing harder actions and greater ease as allowing action at lower motivation, with a prompt still needed. The curve expresses the proposed relationship; it does not supply a measured threshold that applies to every person and task.

An example of the Fogg Behavior Model

A signup request goes unanswered. The offer may have little value to the person, the form may require too many steps, or the request may arrive at the wrong moment. B=MAP gives the team a short set of questions to investigate. It does not tell them which explanation is correct.

What does the evidence show?

A 2025 scoping review of FBM-based health interventions identified six studies. Reported outcomes were promising, but the studies differed in design, populations, interventions and measures. Small samples, self-report and limited controls in parts of the evidence base restrict the conclusions.

An intervention designed with a framework can work without validating the whole framework. These studies do not establish B=MAP as a universal causal law or show that it outperforms other behavior-change models.

Why it matters

The model's appeal is its simplicity. The danger is mistaking a convenient way to organize questions for a complete explanation of behavior. Use it to generate hypotheses, then examine the person, task and setting closely enough to test them.

See the longer Fogg Behavior Model analysis for a critical discussion of its applications and limitations.