Install a reliable prompt at the right moment

A behavior that lacks a prompt won’t happen regardless of motivation or ability — fix the trigger first.

Why it works

Prompts function as contextual cues that bring a behavior to attention at the moment when the person is positioned to act. Without a prompt, even highly motivated and capable people simply forget or allow other behaviors to fill the slot. The Fogg model distinguishes person-internal prompts (hunger, fatigue), contextual prompts (environmental cues), and external prompts (notifications, reminders), each with different reliability profiles.

How to do it

1. Choose a prompt type matched to your context: an external notification if you’re easily distracted; a contextual anchor if you want the habit to be invisible.
2. Place the prompt as close to the behavior as possible — time gap between prompt and behavior opportunity is a failure mode.
3. Test the prompt for three days: if it consistently fails to fire the behavior, the prompt is the bottleneck.
4. Prefer anchor prompts (existing reliable events) over notification prompts, which habituate and get ignored.

Evidence

The role of cues in habit formation is one of the most replicated findings in behavioral research. Habit formation research (Wood & Neal) identifies context cues as essential triggers for automatic behavior; the Fogg prompt category formalizes this. (mechanistic)

Notification-based prompts habituate rapidly; contextual prompts are more durable but require the context to be consistently stable.

Sources

• Wood & Neal (2007), "A new look at habits and the habit-goal interface", Psychological Review

Common mistake

Using a phone notification as a long-term prompt — notifications decay in salience within days and become ignored background noise without frequent change.