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Behavior happens when motivation, ability, and a prompt converge at the same moment.

Cognitive load is the hidden risk to motivation and outcomes.

The advantage is not doing more. It is making better decisions easier.

After a career spent in construction, and a more recent focus on sustainability and sustainable buildings, Darren Evans is no stranger to driving change in a challenging industry. And it's given him some unique insights into motivation, intent, and meaningful change, closely linked to behavioural science. He writes:

In complex, high-stakes environments, behaviour rarely fails because people don’t care. It fails because the system quietly makes the right behaviour too hard to perform. Motivation collapses under pressure.

This complexity is rarely more evident than the construction industry, and most particularly building sustainable buildings. The sustainability conversation is full of good intentions. Developers want better buildings. Design teams care about outcomes. Clients talk about legacy, performance, and long-term value. And yet, the same problems repeat themselves: late changes; diluted ambition, over-complex strategies that quietly get value-engineered out. This is usually explained as a motivation problem: not enough buy-in; not enough leadership; not enough pressure; government policy needs to tighten up. But behavioural science tells a different story.

It's here that Stanford professor BJ Fogg's Behaviour Model becomes highly relevant.

It is disarmingly simple: behaviour happens when motivation, ability, and a prompt converge at the same moment. If one or more of these is missing, then the behaviour will not happen.

Most people will not be conscious of this, but the fact is that when ability drops, motivation becomes irrelevant. Ability, in Fogg’s work, is not about competence or intelligence. It is about how easy a behaviour is to perform right now, given the person’s scarcest resource—time. Under time pressure, with uncertainty, risk, and competing demands, even highly motivated professionals struggle to act. Not because they don’t know what to do, but because doing it requires more mental effort than the system allows.

Cognitive load is the hidden risk

Research in implementation science consistently shows that information-heavy interventions fail when they increase mental effort without reducing friction. Susan Michie’s COM-B model places capability at the centre of behaviour change for a reason. If people lack the psychological capacity to act in context, intention does not translate into behaviour.

Applied in the construction and development sectors, systems routinely overload people’s brains. Multiple standards. Conflicting guidance. Fragmented responsibilities. Late-stage information. Ambiguous accountability. Did you know that there are over 20 recognised sustainability standards just in the U.K.? From the outside, it looks like resistance. From the inside, it feels like survival.

This is not a knowledge gap. It is a design failure.

Why “more information” rarely fixes the issue

More information adds cognitive load but does not increase ability. Unless it simplifies decisions, removes uncertainty, or reduces coordination effort, it quietly makes action harder.

This is why sustainability strategies often look robust on paper and fragile in practice. They are intellectually sound but behaviourally brittle.

Designing for ability changes everything. Ability-first design asks different questions.

Do people care enough?

Have we explained it clearly?

What decisions can be removed or automated?

What can be made default?

What needs to happen earlier, when capacity is higher?

What can be made routine rather than exceptional?

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When performance targets are embedded early, when trade-offs are surfaced before pressure mounts, and when teams are given clarity instead of optionality, behaviour changes without drama.

Not because people suddenly care more, but because the system stops getting in their way. The advantage is not moral superiority or regulatory compliance; it is reduced cognitive effort across the system. Projects that perform well do not rely on heroics. They rely on clarity, sequencing, and decision environments that make the right outcome the easy outcome.

That is where behavioural science meets real-world application. And it is why the most effective sustainability work looks less like persuasion and more like infrastructure.

The advantage is not doing more. It is making better decisions easier.

These ideas and behavioural triggers are contextualised and explored in Darren's book: The SustainAbility Advantage, showcasing how sustainability stops being a burden when it increases ability rather than relying on motivation.

Fogg Behavior Model - BJ Fogg. (n.d.). Fogg Behavior Model. https://www.behaviormodel.org/

The COM-B model for behavior Change - the Decision Lab. (n.d.). The Decision Lab. https://thedecisionlab.com/reference-guide/organizational-behavior/the-…

The Sustainability Advantage: Systematic solutions for sustainable construction and design: Amazon.co.uk: Evans, Darren: 9798268812336: Books. (n.d.). https://www.amazon.co.uk/Sustainability-Advantage-Systematic-Sustainabl…

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