3D · Divert · Discomfort · Delight: the idea under every HDI model

HDI rests on one simple idea: 3D · Divert · Discomfort · Delight. Three words, easy to keep in mind on a hard day. 3D is the umbrella over the seven HDI models, and it runs through each one.

3D is also a way back to three dimensions: up and down, forward and back, left and right. Smells, sounds, colours and the freedom of open space. The screen is flat; the world your body and senses know best is not.

3D is HDI's framework, not a research finding. Each step draws on published work, listed below, but no study has tested the three steps together.

Divert: turn toward something, not only away

When the pull toward the screen comes, willpower alone rarely wins. Divert means you do not just fight the pull; you turn toward something that does you more good. The things you can turn to are your copers: 3O Others · Outdoors → Outstanding, 3A Awe · Alertness → Achievement, 3B Basics · Body → Balance, 3S Separation · Solitude → Success and 3F Filter · Focus → Flow.

Duckworth and colleagues argued that choosing or changing the situation, such as where you sit or what is within reach, may be especially effective because it acts before an impulse grows strong. That supports the direction of Divert. It does not test HDI's model or promise that any one swap will work for you. Duckworth and colleagues

Discomfort: the first days are supposed to feel awkward

The first days of any change feel awkward. That is not a sign it is failing. What carries you through are your energizers, 3M Meaning · Momentum → Mastery and 3E Environment · Energize → Empower: a reason that matters to you, and surroundings that make the next step easier.

Tams and colleagues found that people with a stronger fear of being without their phone reported more stress when they could not use it. That link was no longer significant only when people both knew how long the break would last and had control over it. Expect friction rather than reading it as failure, and set your own break with a clear end. Tams and colleagues

Delight: repetition turns effort into choice

Repeat the new step, and what took effort becomes familiar, then something you enjoy and choose for yourself. Delight is the point where you no longer need to push.

Lally and colleagues followed people who repeated a chosen daily behaviour in the same context. It became more automatic with repetition, but the estimated time varied widely, from 18 to 254 days, and missing one day did not materially set people back. The study measured automaticity, not enjoyment. Lally and colleagues

One evening in 3D

At 22:30 your thumb reaches for the feed. Divert: put the phone on the hallway charger and open the book on your nightstand. Discomfort: the first evenings feel restless, and that is expected. Delight: by the second week, those ten pages are the part of the evening you look forward to.

Your pace may be slower or faster; this is an example, not a schedule. If the open things of the day keep pulling even after you have chosen the book, that is a different question. HDI describes it with 1C, The Closure Model: we live unfinished days.

What this does not establish

The studies cited here concern parts of the sequence: situational self-control, stress during phone separation and habit formation. None of them validates 3D as a whole, its order or its use for an individual. A clear example is not an empirical test.

3D is offered as an educational framework, not a diagnosis, a treatment or a score. You can try one step, notice what happens and describe it in your own words.