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🧠 Theory of Planned Behavior.

September 10, 2026
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FROM THE CREW

Hi there.

Everyone’s doing squats. Nobody’s doing… whatever the brain equivalent is. We tried a memory test yesterday and pulled a mental muscle.

But it’s a fair question: if you can train a bicep, why not attention? Marketing runs on focus, and ours has been suspiciously wobbly. Smartphones didn’t help. AI definitely won’t.

Reps start today. Mentally.

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PSYCHOLOGICAL EFFECT

Theory of planned behavior

We’ve been meaning to start running since March. The shoes arrived. They’re still in the box.

You might call it laziness. Partly, at least. But there’s a different model to this demeanor. And marketers keep ignoring it.

Psychologists call it the Theory of Planned Behavior. Ajzen, who worked on proving this bias late last century, says three inputs decide whether intention turns into action:

  • Attitude: do we believe the behavior pays off.
  • Subjective norms: do people we respect do it too.
  • Perceived behavioral control: do we believe we can actually pull it off.

Score well on all three and intention forms. Intention plus control then predicts behavior.

Researchers reviewed 185 studies and found the model explained 39% of variance in intention and 27% in behavior. Which explains the meal-kit box we swore would fix our diet.

Great attitude, friends doing it, zero belief we’d cook on a Tuesday.

Prospects sit in the same gap. They want it. They don’t buy. To fix this, you’ll need to fix all three inputs, not just the one your copy is comfortable with.

Three ways to leverage Theory of Planned Behavior

1) Sell the arithmetic

You’re tempted to sell the aspiration.

But attitude comes from beliefs about what a behavior actually produces. Vague virtue doesn’t move anyone.

Oddbox, a UK wonky-veg subscription, does the sums for the buyer.

Its site says a medium box, weekly for three months, rescues 85kg of fruit and veg. Roughly 200 meals’ worth.

Not “help fight food waste.” A number, a unit, a timeframe.

Beliefs beat adjectives. Specificity is what makes an attitude worth acting on.

Our take: rewrite one benefit line as arithmetic the buyer can picture.

Autonomy converts because a choice we made ourselves is harder to abandon than one we accepted.

2) Show the norm

Subjective norms are what we assume people like us are doing.

Telling households to save energy does little. Showing them the neighbors does more.

Opower, now part of Oracle, mailed reports comparing each home with similar nearby ones.

Across twelve utilities, consumption fell 2.0% on average, and the savings outlasted the mailings.

They did it without discounts or guilt tripping their customers. They just sent a bar chart with the neighbors on it.

What you can do: in onboarding, show what comparable customers did. Same plan, same industry, same size.

3) Kill the doubt

Perceived behavioral control is the belief we can pull it off. It’s the objection nobody types into your chat widget. Sofas fail this test constantly.

Wrong stairs, tight doorway, hour four of assembly.

Swyft ships sofas as boxes one adult can shift, clicking together without tools.

Its site leads with 24-hour delivery and 100-day returns. The doorway and the regret, both handled. That de-risks the decision more than the price of the product itself.

The lesson: Free shipping doesn’t fix self-doubt. A rehearsal does. Find the step where buyers doubt themselves, then remove the doubt, not the cost.

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CLICKWORTHY

META: …just gave a billion people a buyer’s agent, Muse. And Muse doesn’t answer questions, it does the work: opens a browser, fills forms, negotiates, then checks out with Stripe’s Link. It’s the first agent covered by Link’s purchase protections, using one-time-use cards. Cha-ching?

OPENAI: Climbing the charts? ChatGPT.com is now the ninth-biggest website in the US, up 48% year over year to 1.09 billion monthly visits. Bing fell 50% over the same stretch, while DuckDuckGo lost 16%. It’s a battlefield out there.

GOOGLE: Compliance with the EU’s Digital Markets Act has, in Google’s words, caused the worst drop in search quality in its 29-year history. European results now push comparison sites up top and strip real-time pricing from hotel, flight, and restaurant carousels. Big ouch.

SOCIAL MEDIA: Australia wants to force Meta, Google, and TikTok to let users switch off recommendation algorithms, with substantial penalties for platforms that don’t comply. It’s only a proposal for now, but we already foresee an issue if a chronological feed becomes the only option. And that is, high-frequency posts, aka spam.

ICYMI, last time we looked at the Self Determination Theory.

The “Planning, trying, doing” Crew.

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