Notes

From the desk, after the clinic

These pieces are teaching notes, not platform documentation. They assume you already ran the test.

12 March 2026

Reading a null result without writing an apology

How to keep a null onboarding test in the roadmap conversation without dressing it up as “directional”.

2 February 2026

Metric trees that survive a mobile staged rollout

Why holdback groups and store-listing traffic break a tree that looked tidy in a slide.

18 January 2026

When to stop an app experiment you already dislike

Stopping rules that are not “the PM got bored” and are not “wait for significance at all costs”.

9 December 2025

Write-ups that survive a leadership review

A length, a verb, and a caveat that still exist after the deck has been forwarded twice.

21 November 2025

Secondary metrics without turning them into a hunt

A filing system for interesting numbers that must not be allowed to rewrite the primary claim.