Fogg's Behavior Model shows that three elements must converge at the same moment for a behavior to occur: Motivation, Ability, and Trigger. When a behavior does not occur, at least one of those three elements is missing.
Using this model as a guide, designers can identify what stops people from performing behaviors that designers seek. For example, if users are not performing a target behavior, such as rating hotels on a travel web site, the Fogg's Behavioral Model (FBM) helps designers see what psychological element is lacking.
The FBM also helps academics understand behavior change better. What was once a fuzzy mass of psychological theories now becomes organized and specific using this model.
The FBM highlights three principal elements, each of which has subcomponents:
1. Core Motivators: Pleasure/pain, hope/fear, social acceptance/rejection.
2. Simplicity Factors that facilitate ability: time, money, physical effort, brain cycles, social deviance, non-routine.
3. Triggers: Facilitator, spark, signal
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