persuasion
Triggers
What are triggers (internal, external, self-initiated)?
Triggers are the prompts that start an action. External triggers come from outside - a notification, email, badge or button telling you what to do next. Internal triggers come from within - an emotion, routine or association that makes you reach for the product unprompted. The goal of habit-forming design is to move people from needing external nudges to acting on internal ones.
Also known as: triggers, internal triggers, external triggers, self-initiated triggers
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Watch the recap 1:09
The demo
Watch a habit form over a week or two. Each day, something triggers you to open the app. Step through and notice what's doing the triggering - and how it changes from an outside nudge to an inside pull.
What this demo shows (text version)
The demo steps through a series of days as a habit forms. On the early days, an external trigger - a notification or reminder - is what prompts you to open the app; without it, you wouldn't have come back. As the days pass, the demo shows an internal trigger taking over: a feeling like boredom, curiosity or a daily routine increasingly drives the action with no notification at all, until you're opening the app unprompted - self-initiated use.
That hand-off is the heart of habit-forming design: external triggers seed and teach the behaviour, and the aim is to build the association that turns it into an internal trigger, so the product becomes the automatic response to a recurring feeling. Used honestly it answers a genuine need; manufacturing negative emotions just to trigger use, or leaning forever on external prompts (nagging), is the unethical version.
Every action begins with a trigger, and there are two kinds that matter. External triggers (notifications, emails, prompts, prominent buttons) tell people what to do and where - essential early on to bring users back and teach the behaviour. Internal triggers are feelings or situations - boredom, loneliness, "I wonder…", a time of day - that prompt the action with no external nudge at all. A habit has truly formed when an internal trigger reliably drives the behaviour; the product has become the go-to response to a feeling. Design uses external triggers to seed a habit and aims to hand off to internal ones. The ethical line: form habits around genuine user value and don't manufacture negative emotions just to trigger use.
Early on, the app needed to poke you - a notification, a reminder. But notice the shift: by the end, it's a feeling that sends you back, no prompt required. That hand-off from external to internal triggers is exactly how a habit forms. The honest version attaches to a feeling your product genuinely helps with; the cynical one manufactures the discomfort just to be the cure.
External triggers are environmental prompts that carry information about what to do next: notifications, emails, app-store badges, SMS, in-product calls to action and prominent buttons. They are how you re-engage users and teach a new behaviour, but relying on them forever is fragile - people tune them out (habituation) or switch them off, and over-using them tips into nagging.
Internal triggers are mental or emotional associations that prompt action with no external cue: boredom prompting a scroll, uncertainty prompting a search, loneliness prompting a check-in, a daily routine prompting a habit. When a product becomes the automatic response to a recurring feeling or situation, the habit is self-sustaining - this is the destination habit-forming design aims for, and "self-initiated" use (the user starting unprompted) is its signature.
The design arc is to use external triggers to seed and reinforce a behaviour, while building the association that turns it into an internal trigger - delivering real value reliably enough that the feeling becomes linked to your product. The ethics are crucial: it's legitimate to become the answer to a genuine need, but manufacturing negative emotions (anxiety, FOMO, insecurity) purely to create an internal trigger is manipulation, and over-leaning on external triggers becomes nagging.