Not rational actors. Not power users. Not the imaginary person in the requirements doc. Seven thinking lenses drawn from behavioural science, usability, systems thinking, and AI interaction design.
Each lens is a different way of seeing the same design problem. You rarely need all seven at once. Pick the ones that fit.
Can we solve this psychologically instead of logically? The human response to a thing is not determined by the thing itself but by the frame through which it is perceived.
A 10-minute wait with a progress bar feels shorter than a 5-minute wait with no feedback. The logical solution is expensive. The psychological solution is cheap.
Where is friction helping and where is it hurting? Every interaction has friction. Most is destructive, but some is protective. The craft is knowing which is which.
Defaults are the most powerful design tool in existence. Most people never change them. The way choices are presented determines what people choose.
What triggers action? What sustains it? Behaviour happens when motivation, ability, and a prompt converge at the same moment. Design all three.
If motivation is uncertain, make the task trivially easy. If the task is hard, you need strong motivation. But without a prompt at the right moment, nothing happens.
Ethics gate: Would the user feel manipulated if they understood the mechanism?
Does this pass the basics? Universal patterns of quality that experienced designers converge on. Run this first as a fast diagnostic.
Design for user goals, not tasks. A task is "fill in this form." A goal is "get approved for a mortgage." Design for goals and you often eliminate entire task sequences.
How do we handle uncertainty, confidence, and human override? AI systems must earn trust through transparency, maintain human agency, and degrade gracefully.
Users should always feel in control, never controlled. Not every feature should be fully automated — the design question is where on the spectrum it should sit.
What are the second-order effects? Every design exists within a system of feedback loops, delays, and emergent behaviour. Design for how the system behaves over time.
"We'll add notifications to increase engagement" → notifications create anxiety → users mute them → engagement drops below pre-notification levels. Always ask: "And then what?"
Does this make anyone feel something? Functional design is table stakes. Memorable design creates emotional resonance. Brand is not a logo — it's a gut feeling.
The gap between usable and pleasurable is where competitive advantage lives. When everyone zigs, zag. Differentiation is not about being better at the same thing — it's about being different in a way that matters.
Neumeier test: Can a user describe what this does and why it matters in one sentence?
These lenses are not our invention. They are distilled from decades of work by people who spent their careers watching real humans interact with real systems. We built the tool. They built the thinking.
Vice Chairman at Ogilvy. Author of Alchemy. Pioneer of applying behavioural science to marketing and design. His core insight: psychological value is cheaper to produce than logical value.
Author of The Design of Everyday Things. Coined "affordances" in design. Former VP of Apple's Advanced Technology Group. Made the case that most design failures are signifier failures.
Author of Don't Make Me Think. Proved that users scan, satisfice, and muddle through. Every question mark the interface raises is a cognitive cost.
Authors of Nudge. Thaler won the Nobel Prize in Economics. Their work on choice architecture showed that defaults shape behaviour more than persuasion.
Stanford researcher. Creator of the Fogg Behavior Model (B = MAP). Showed that behaviour only happens when motivation, ability, and a prompt converge simultaneously.
Author of Influence. Identified six principles of persuasion through decades of field research. His work underpins every modern growth and conversion framework.
Co-founder of Nielsen Norman Group. His 10 Usability Heuristics remain the standard diagnostic for interface quality after 30 years.
Former head of design at Braun. His 10 Principles of Good Design influenced Apple, Muji, and a generation of industrial and digital designers. "Good design is as little design as possible."
Author of Thinking in Systems. Environmental scientist who mapped how feedback loops, stocks, flows, and leverage points govern complex system behaviour.
Run the seven lenses against your design. Describe a feature, flow, or interface — the design agent applies the relevant lenses and returns actionable findings.
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