Sample frameDay 217·Product · Satisfaction

Some features earn you no credit at all. Some earn it in proportion. One gets you remembered.

Product.

The Kano Model

5 min read·Apply by lunch

The question

The last five things your team shipped: which kind was each one — the sort nobody thanks you for but people leave over, the sort where more is straightforwardly better, or the sort nobody asked for and everybody mentioned afterwards — and could you say which was which without checking?

The idea

In 1984 Noriaki Kano, a professor of quality management at the Tokyo University of Science, published a paper with Nobuhiko Seraku, Fumio Takahashi and Shinichi Tsuji in the Journal of the Japanese Society for Quality Control. It was called 'Attractive Quality and Must-Be Quality', and its argument was that satisfaction isn't a single dial. Drawing on Frederick Herzberg's work on what satisfies and dissatisfies people at work, Kano showed that product attributes fall into distinct kinds, each paying out on a different curve. Must-be quality is invisible when it's there and fatal when it isn't — nobody praises a hotel for hot water, everybody leaves over the lack of it. One-dimensional quality is the honest trade: more is better, less is worse, and customers will tell you exactly where they'd like more. Attractive quality produces delight, and no survey hands it to you, because people don't request what they haven't imagined. Then comes the part that costs money. Kano observed that attractive attributes don't stay attractive: today's delight becomes tomorrow's expectation and eventually becomes the thing you get complaints about. Free returns made that journey; so did the camera on a phone. The trap is one priority number laid across all three — three payoff curves scored on a single scale, which is how a hard quarter of shipping ends with satisfaction exactly where it started.

The framework

01
Sort the list before you rank it.
Take the roadmap as it stands and sort every item into the three kinds before prioritising anything, because ranking a mixed list is how the wrong work wins. Must-be attributes earn nothing when present and cost you everything when missing. One-dimensional attributes pay out in proportion — faster is better, cheaper is better, more storage is better. Attractive attributes pay out disproportionately and cost nothing when absent, because the customer never knew to want them. Three different payoff curves shouldn't share one scale, so sort first and rank inside each kind.
02
The two-question test Kano actually ran.
Kano's method asks every question twice. The functional form: how would you feel if the product had this? The dysfunctional form: how would you feel if it didn't? Each gets the same five answers, from liking it that way through neutral to disliking it that way, and the pair of responses places the attribute in a category. One question can't do it, because one question can't see asymmetry. You can run a crude version on five customers and five attributes in an afternoon; the pattern tends to show up long before the sample becomes respectable.
03
Must-be quality buys you a seat, never a win.
The asymmetry is the whole practical point. Meeting a must-be requirement earns no credit at all — nobody renews because the invoices were correct — while failing one ends the relationship regardless of how good everything else was. So treat must-be work as insurance rather than investment: get to adequate, verify it stays there, stop. Teams that keep polishing must-be attributes long past adequate are usually doing it because that work is safe, measurable and comfortably inside the skills they already have, which isn't the reason they give.
04
What is decaying on you right now?
Attractive quality doesn't survive contact with competitors. The moment a delight is copied it becomes a comparison, and once it's universal it becomes a must-be — same-day delivery and parcel tracking both made that trip inside a decade. Two consequences follow. The pipeline needs a fresh attractive attribute on a regular cycle, because the current one is depreciating even while it works. And the running cost of yesterday's delight never falls; you keep paying to provide it, you simply stop being paid in goodwill for it.

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