Short-form definitional guides explaining individual PM terms, metrics, and concepts.
The “40% is healthy” DAU/MAU benchmark is dated. Mixpanel’s 2026 data puts blended B2B SaaS stickiness at 31-33%, and the real range runs from 8% finance tools to 88% APAC entertainment apps. Five steps to calculate it correctly and use it as a diagnostic rather than a target.
Weighted shortest job first divides cost of delay by job size — but Reinertsen’s version has units and SAFe’s does not, and the two rank the same backlog differently. The column-normalization step most summaries drop, a worked example where a job size of 1 beats a statutory deadline, and the three places the method does not apply.
Gross merchandise value has no accounting definition, which is why Etsy could report the same quarter as both up 2.4% and down 3.8% — and both were correct. The metric, updated for Depop’s completed sale to eBay, and the five things to state before the number leaves your team.
Ask three PMs at the same company to define activation rate and the answer often comes back three different ways — one measuring signups who complete onboarding, one measuring signups who hit a specific in-product action, one measuring signups who return a second time. All three call themselves “activation rate.” Only one of them is…