Journal
Notes we still stand by after class.
Short essays from faculty. They are not substitutes for a studio, and they do not pretend a blog post can replace a denominator debate.
Why week-one retention is a lazy north star
W1 is easy to move with onboarding copy. That is exactly why it is a poor quality score for most products.
Survival curves versus classic cohort grids
Heatmaps hide when people leave. A curve makes the hazard visible, at the cost of a less familiar picture.
How UK subscription teams misread monthly cohorts
Direct debit dates, cooling-off windows, and VAT invoices do not care about your product week.
The n-day retention trap in mobile
D7 is not a personality. It is a window that punishes products people use in bursts.
Building a cohort table without a warehouse
Exports, careful clocks, and the honesty required when your last column is always incomplete.