Design Principles
Cognitive Cost of Clicks
What makes a click expensive isn't the click itself — it's the thinking required to decide whether to make it.
Where it comes from
It's one of Steve Krug's counter-intuitive observations from Don't Make Me Think: what makes a click expensive isn't the click, it's the thinking that goes into deciding whether and where to click. The mechanical action is trivial; the deliberation is what tires people out.
Why it matters for your website
Krug's insight on clicks is counterintuitive: it doesn't matter how many clicks a journey takes, as long as each one is obvious. A ten-click path through unambiguous, mindless choices is less fatiguing than a three-click path where every click requires stopping to think. The cost is cognitive, not mechanical. Any point in a flow where the user has to pause and reason about what to do next is a conversion risk — not because of the click, but because of the thinking that precedes it.
This overturns the usual 'fewer clicks is always better' rule. A ten-click path of obvious, mindless choices is less fatiguing than a three-click path where each step demands a pause to reason — because the cost is cognitive, not mechanical.
The practical target, then, isn't to minimise clicks but to minimise thinking. Any point in a flow where the user has to stop and work out what to do next is a conversion risk — not because of the click itself, but because of the hesitation that precedes it, and hesitation is where people drop out.
Wrong vs right
Collapsing a flow into fewer clicks by cramming several ambiguous decisions into each step, forcing the user to stop and reason.
More steps if needed, each one an obvious, mindless choice, so the path feels effortless despite the count.
An unclear navigation choice where every option requires interpretation before clicking.
Options labelled so clearly that the next click is obvious and requires no deliberation.
Optimising purely for the smallest number of clicks, at the cost of making each one harder to decide.
Optimising for obviousness, so each click is easy even if the journey has a few more of them.
Understanding Cognitive Cost of Clicks
Krug's insight about clicks is deliberately counter-intuitive: the number of clicks in a journey matters far less than how much thought each one requires. The physical act of clicking is effortless; what's costly is the deliberation beforehand — working out which option is right, whether to proceed, what will happen next. The expense is cognitive, not mechanical.
This reframes a popular rule of thumb. The instinct to minimise clicks can backfire if it crams ambiguous decisions together: a three-click path where every choice demands reasoning is more tiring than a ten-click path of obvious, mindless steps. People don't mind clicking; they mind thinking about clicking.
So the thing to minimise isn't clicks but hesitation. Any point where the user has to stop and reason about what to do next is a conversion risk — not because of the click, but because of the thinking that precedes it. Make each step obvious and the length of the path matters surprisingly little. It connects to self-evident design, satisficing, and cognitive load.
How Kweri checks it
Kweri can flag some likely sources of decision-cost in a flow — ambiguous labels, unclear next steps, choices that seem to require interpretation — and prompt you to make each step more obvious rather than simply shorter. What it can't measure directly is how much a given user actually hesitates at each point, which depends on their familiarity and context. So Kweri surfaces steps that look like they demand thought and points away from the 'fewer clicks at any cost' instinct, while the real measure of hesitation comes from watching users move through the flow.
FAQ
What is the cognitive cost of clicks?
It's Steve Krug's idea that what makes a click expensive isn't the click itself but the thinking required to decide whether and where to click. The mechanical action is trivial; the deliberation is the real cost.
Is fewer clicks always better?
No — that's the misconception Krug corrects. A longer path of obvious, mindless choices is less fatiguing than a shorter one where each click requires stopping to think. What matters is how much thought each click demands, not the count.
What should I minimise if not clicks?
Hesitation. Minimise the thinking each step requires by making choices obvious and labels clear. Any point where the user has to pause and reason about what to do next is a conversion risk, regardless of how few clicks the path has overall.
Why does an ambiguous click cost more than an obvious one?
Because the cost is cognitive. An obvious click is effortless; an ambiguous one forces the user to stop, interpret the options, and decide — and that deliberation, and the hesitation it creates, is where people lose momentum and drop out.
Who came up with this idea about clicks?
Steve Krug, in Don't Make Me Think. It's one of his counter-intuitive observations about web usability, reframing the cost of a journey from the number of clicks to the amount of thinking involved.
Related principles
Any behaviour — including clicking a CTA — requires motivation, ability, and a prompt to be present simultaneously; if any one is missing or too weak, the behaviour won't happen.
The brain has a limited processing budget — demand too much and performance collapses.
The more choices you show, the longer people take to decide — and the likelier they pick nothing.
Attribution & sources
Identified by Steve Krug. Catalogued from Don't Make Me Think (Steve Krug).
One of Krug's observations on web usability; there's no single canonical web source.
See Cognitive Cost of Clicks on your own site
Run a free Kweri audit — a plain-English review of your site’s speed, accessibility, SEO and design, ranked by what to fix first. No login, no jargon.
Run a free audit →