7 Method Libraries for Experiments & Concept Tests


7 Method Libraries for Experiments and Concept Tests

by Jeff Humble


Dear Reader,

Today, I want to share some behind-the-scenes research on Designing Product Experiments.

When I design a course, I go deep on research...like buying every book on the topic and scouring the internet for every possible PDF.

For our course on product experiments, 7 playbooks in particular influenced the course. Here they are, ranked in order of usefulness:

1. The Experiment Library by Strategyzer

2. Validation Guide by Board of Innovation

3. Compendium of Innovation Methods by Nesta

4. Experiment Playbook by Lean Apps

5. The Real Startup Book by Kromatic

6. Landscape of Innovation Approaches by States of Change

7. Guide to Scaling Product-Led Experimentation by Amplitude

Unfortunately, most of these playbooks require an email to download.

If you want a little preview of each before you give away your info, I wrote a short review of each playbook in the full article. It's a great way to bookmark this resource for later. Check it out below:


COURSE: Defining UX Strategy
Learn to design a winning strategy that aligns design with business.
Next cohort: Feb. 16-Mar. 30, 2026
Join the Waitlist
Early bird pricing launches Jan. 9th!


COURSE: Facilitating Workshops

Learn to turn meetings into momentum and clear decisions.
Next cohort: March 23–April 30, 2026
Buy a Seat
Only 6 Regular seats left!


Until next week, try out one experiment method at work!

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

Title of Newsletter in Titlecase By Hannah Baker Dear Reader, Before we jump into new ideas for the year ahead, we wanted to pause for a moment. If your inbox was anything like ours last year, there’s a good chance you missed a few newsletters. So instead of sending another new idea right away, we put together a curated catch-up, a handful of pieces from 2025 that capture the questions we kept returning to. If you only read a few things from us last year, these are a good place to start. 🧠...

What Can't AI Do in Design in 2026 By Hannah Baker Dear Reader, If you work in design, your feeds are probably saying the same two things on repeat: Here’s everything AI can do for you, and Here’s why you should be terrified. Most of that conversation focuses on tools and job titles: “Will designers be replaced?” “Which roles are safe?” It makes for good headlines, but it’s not how the work actually changes in real life. A few months ago, walking to my studio listening to a Planet Money...

Does the Double Diamond make sense for AI-enabled teams? by Jeff Humble Dear Reader, For twenty years, the Double Diamond has been our north star. Discover, Define, Develop, Deliver. It's elegant. It's teachable. It's in every junior's UX case study. And it made sense…when it was created. All that upfront research made economic sense when coding was the most expensive part of the process. Better to get it right before handoff because it's expensive for engineering to make changes later. But...