Moment of Power (Intervention Timing)

It's articulated by Maurice Münster and connects to the 'fresh-start effect' in behavioural economics (Hengchen Dai and colleagues). Both show that people are far more open to new commitments at certain moments — beginnings, transitions, after a win — than at others.

Münster's "moment of power" principle — and the related fresh-start effect in behavioural economics — shows that identical interventions have dramatically different outcomes depending on when they are delivered. People in transition, at beginnings, or immediately after positive experience are far more receptive to new commitments than the same people in a neutral or frustrated state. On a website this translates directly to trigger design: when does an upgrade prompt appear? When does a re-engagement email fire? When is the cross-sell shown? The timing question — the "when" of the intervention — is as important as the "what," yet most conversion design focuses almost entirely on message content and ignores delivery timing entirely.

Timing is a variable most conversion work ignores. The same prompt, message, or offer can succeed or fail purely on *when* it arrives — a user in transition or just after a good experience is receptive; the same person, frustrated or mid-task, is not.

This makes the 'when' of an intervention as important as the 'what'. When does the upgrade prompt appear? When does the re-engagement email fire? When is the cross-sell shown? Designing for the moment of power means delivering the ask at the point of maximum receptivity, not at an arbitrary or convenient one.

The moment of power is the principle that receptivity to change is not constant — it spikes at particular moments. People are far more open to new commitments during life transitions, at the start of something, at natural decision points, or just after a positive experience, than they are in neutral or frustrated states. The same intervention, delivered at different moments, can produce dramatically different outcomes.

It connects to the behavioural-economics 'fresh-start effect', which finds people more motivated to pursue goals at temporal landmarks — a new week, a new month, a birthday, a fresh beginning. The lesson for design is that timing is a lever in its own right: when a prompt lands matters, not just what it says.

Yet most conversion work optimises message content and ignores delivery timing almost entirely. The 'when' of an intervention — the upgrade prompt, the re-engagement email, the cross-sell — deserves as much design attention as the 'what', because the right ask at the wrong moment fails. Timing prompts to moments of maximum receptivity is the practical discipline. It connects to internal triggers, the Fogg Behavior Model's prompt, and the default effect.

Intervention timing is one of the harder things for a static review to assess, because it depends on where a user is in their journey and emotional state — information a single page snapshot doesn't carry. Kweri can sometimes note obvious mistimings, such as an interruption fired mid-task, and prompt you to consider whether prompts land at receptive moments. But genuinely optimising the 'when' usually requires journey data and testing across the real flow. So Kweri raises timing as a consideration where it can see it, while acknowledging that the moment of power is largely measured in your analytics, not on the page.

Identified by Maurice Münster (with the behavioural-economics fresh-start effect). Catalogued from Conversion psychology (Münster; fresh-start effect, Dai et al.).

Articulated by Münster and related to the fresh-start effect in behavioural economics; there's no single canonical web source.