Usability Is the Last Thing You Should Be Testing


Usability Is the Last Thing You Should Be Testing

by Jeff Humble


Dear Reader,

Here's a common scenario you might find yourself in:

Somebody in leadership has been pushing for an idea for a long time, and your team finally gets a chance to tackle it. You want to do this by the books, so you design three versions and run a usability test with five users.

You catch some problems early and start feeling pretty confident in your approach. The executives love the design, so everyone is happy.

The idea is finally built, but customers completely ignore it.

It never gains traction, but nobody knows why. Eventually, the leader realizes the idea is a dud and blames the team's execution for the result.

πŸ€¦πŸ½β€β™€οΈ What happened here?

You skipped the desirability test.

Usability should have been the last thing you tested.

4 Checks to "Validation"

Rather than validating an idea, you want to put an idea through 4 different validation checks. Here are they are in the most common order:

  1. Viability, a.k.a. "Should we build this?" - Generally not a design area, validated by business stakeholders
  2. Feasibility, a.k.a. "Can we build this?" - Generally not a design area, validated by tech stakeholders
  3. Desirability, a.k.a. "Will people want this?" - Potential for design, validated by users
  4. Usability, a.k.a. "Will people understand this?" - Owned by design, validated by users

Generally, you will go in that order, meaning usability is the final check and not as crucial as desirability. That might come as a shock to you if you're not aware of the whole process.

Desirability and usability are challenging because they are risks related to people, and people change. What was desirable five years ago may not necessarily be desirable today.

That's why testing is a full-time job. There are always risks related to desirability and usability. Very few designers can test for both.

Testing for desirability is a blind spot for many teams, and it's a good growth role for a senior designer.

Learn more in our four-week course on designing product experiments...only 2 essential seats left!

What methods do you have for testing desirability?

​

​

β€œwErE a FaMiLy HeRe. BrInG yOuR wHoLe SeLf To WoRk.” πŸ€¦πŸΌβ€β™‚οΈ -@tomfall

​

​Source, shared in the Guild​

​

​


​

ONLINE WORKSHOP: Leading Effective Discussions​
​
Learn how to confidently guide discussions, even without authority.
​Date: Sept. 9, 2025 ​
​
Time: 6:00-8:30 PM CEST​
​
Buy a Seat​


UX Strategy Info Session​
​
Move beyond design execution and into strategic influence.
​Date: Sept. 17, 2025 ​
​
Time: 7:00-7:45 PM CEST​
​
Reserve a Seat (free)


COURSE: Facilitating Workshops
​
Learn to design and lead engaging workshops that lead to real results.​
​
Next Cohort: Sept. 29 – Nov. 6, 2025
​Early Bird Ends: Aug. 22 – Save €200​
​
Buy a Seat​


COURSE: Defining UX Strategy
​
Learn to design a winning strategy that aligns design with business.
​Next Cohort: Oct. 13 – Nov. 24, 2025

Save €300 for a limited time!
​
Buy a Seat​

​

​

​

​

Until next week, y'all! ✌️

​

Jeff Humble
​UX Strategist & Co-Founder
​
The Fountain Institute

​

​

The Fountain Institute

The Fountain Institute is an independent online school that teaches advanced UX & product skills.

Read more from The Fountain Institute
diverge explore converge diagram

10 Design Diagrams To Study Instead of Staring Into the Void by Jeff Humble Dear Reader, It's that time of the year. Another boring Q3 earnings call, and all you want is to go back to the beach. You look at yourself in Zoom, and all you see is a bottomless void. Hey. Stop that. Instead, check out some of the best Jeffing diagrams on the internet. At least you will look like you are kind of working... 1. Diverging and converging in action by Nicholas Frota Designers talk a lot about diverging...

Six-screen signup: SSO/login, email entry, verify email (pre- & post-entry states), OTP with timer, success.

Level-up your critiques in 3 questions By Hannah Baker Dear Reader, You know the critique that starts with β€œquick feedback” and ends 45 minutes later with five conflicting opinions and no next step? Or the one where a senior voice speaks first and the room quietly aligns, even when the data points elsewhere. Here’s a simple pattern, adapted from Visual Thinking Strategies (VTS), that pulls critiques out of taste debates and into clearer decisions. What VTS is (in 60 seconds) VTS is a...

What is design strategy?

The Summer Edition(and a Free Masterclass) by Jeff Humble Dear Reader, I'm taking some time off for summer, and I hope you are, too. When I'm off, I end up watching a lot of YouTube, so... A Free Masterclass on YouTube If you've ever wondered about design strategy, this masterclass has you covered. It's called "What is Design Strategy?" The toolbox of the design strategist is incredibly powerful, but it's not well documented. See what it looks like when the designer's sphere of influence...