Make It Timely (Trigger at the Right Moment)

The Science Behind Make It Timely (Trigger at the Right Moment)

Timing is not a minor logistical detail in behaviour change, it is often the single most important variable. The principle of 'making it timely,' developed and championed by David Halpern and the UK's Behavioural Insights Team (commonly known as the Nudge Unit), holds that the same intervention delivered at different moments can produce dramatically different outcomes. A message that lands when a person is already thinking about the relevant topic, already feeling motivated to act, or already experiencing a natural psychological reset will outperform the identical message sent at a random or poorly chosen time, not by a small margin, but often by multiples.

The psychology behind this is rooted in several interlocking mechanisms. First, there is the concept of 'cognitive availability': when a subject is already top-of-mind for someone, they require far less mental effort to engage with a prompt about it. A person who woke up on Monday morning with a stiff lower back from a weekend of gardening is already thinking about their body; your message about booking a follow-up appointment meets them exactly where their attention already sits. Second, researchers have documented what they call 'fresh start effects', a phenomenon studied extensively by behavioural scientists including Hengchen Dai, Katherine Milkman, and Jason Riis at the Wharton School. Their work shows that people are significantly more likely to pursue aspirational goals immediately following temporal landmarks: the start of a new week, a new month, a birthday, or the beginning of a new season. These moments feel like a clean slate, reducing the psychological weight of past inaction.

Third, there is the role of embodied cues, physical sensations that prime health-related thinking. Seasonal transitions are particularly powerful in allied health. The shift from winter to spring prompts people to become more physically active, which also surfaces latent awareness of old injuries and chronic pain. The beginning of winter, conversely, often brings the return of joint stiffness and reduced mobility. Patients who haven't thought about their osteopath or physiotherapist for months will suddenly find those practitioners relevant again. Your re-engagement message, if timed to these seasonal moments, arrives not as an interruption but as a timely answer to a question the patient is already asking themselves.

Finally, there is strong evidence that anniversaries function as powerful psychological triggers. The anniversary of a significant health event, a surgery, a sports injury, or simply a patient's first visit to your clinic, reactivates associated memories and emotions. Research in autobiographical memory shows that people naturally reflect on past experiences at their one-year mark. A message that acknowledges this anniversary ('It's been a year since we first worked together on your shoulder') doesn't just feel personalised; it arrives at a moment of natural psychological openness, when the patient is already, in some sense, thinking about that chapter of their health journey.

The Research

How to Apply This in Your Practice

The first step in applying this principle is to stop thinking about re-engagement campaigns as something you send when it's convenient for your admin team, and start thinking about it as something you architect around your patients' psychological calendar. Map out the moments of maximum receptivity across the year and build your outreach schedule around them. In the Australian context, these moments include: the first Monday back after the Australia Day long weekend (people are stiff, they've been active, and the 'fresh start' of a new working year still has psychological momentum); the beginning of autumn (March), when people start reducing outdoor activity and old musculoskeletal complaints resurface; the lead-up to winter (May-June), when joint pain and reduced mobility become more salient; and the return of spring (September), when patients begin thinking about getting active again and want to address the injuries that held them back.

Second, build anniversary-based triggers into your practice management system. Every patient who has been inactive for 10-14 months should receive a message timed to the approximate anniversary of their first or last appointment. The message copy should reference this directly, not in a gimmicky way, but in a human one. Something like: 'Hi Sarah, it's been about a year since we last worked on your lower back together. We hope you've been doing well. If things have started to tighten up again, as they often do around this time of year, we'd love to help. We have availability this week.' This message works because it is timely on two levels simultaneously: the anniversary anchor and the implicit seasonal cue.

Third, consider the micro-timing within a day and week, not just the macro-timing across the year. Research on email open rates and response behaviour consistently shows that Monday mornings (particularly between 8am and 10am) outperform mid-week afternoon sends for health-related prompts. The 'fresh start' effect operates at the weekly level too, Monday carries the psychological weight of a new beginning, which makes people more receptive to aspirational health messages. Avoid Friday afternoons, when attention is on the weekend, and avoid mid-month, mid-week sends that carry no temporal significance whatsoever. If you are sending an SMS, the window is even tighter, aim for 8am to 9am on a Monday or the morning after a public holiday.

Fourth, layer your timing triggers with contextual relevance to make the message feel almost uncanny in its precision. A podiatry clinic, for instance, might send re-engagement messages in September with copy that references the shift to open-toe shoes and increased walking as summer approaches. A physiotherapy practice might target the week after the AFL or NRL season ends, when weekend warriors feel the accumulated toll of a season's worth of backyard footy. A massage therapist might reach out in the first week of school holidays, when parents who've been running on adrenaline finally have a moment to think about their own bodies. These contextual layers transform a generic 'we miss you' message into something that feels genuinely relevant, because it is.

Seeing It in Action

Your Action Plan

1. 1Build a 'psychological calendar' for your practice, identify the 6-8 moments per year when your patients are most likely to be thinking about their health (post-long-weekends, seasonal transitions, new year, start of spring) and schedule your re-engagement campaigns to these dates, not to your admin team's convenience.
2. 2Configure your practice management software to flag patients who are approaching the 10-12 month anniversary of their last appointment, and trigger a personalised re-engagement message that references both the time elapsed and a seasonally relevant health concern.
3. 3Set your SMS and email sends to go out on Monday mornings between 8am and 10am, the 'fresh start' effect is most potent at the beginning of the working week, and this is when patients are most receptive to aspirational health prompts.
4. 4Write at least three versions of your re-engagement message copy tailored to specific seasonal contexts (e.g. post-summer stiffness, pre-winter joint care, spring return-to-activity) so that the message content reinforces the timing cue rather than contradicting it.
5. 5Track response rates by send date and time over three to six months, and use this data to refine your timing model, the goal is to identify the highest-converting moments specific to your patient demographic and geographic context, then systematise those windows as your permanent re-engagement schedule.