The design was fine and the launch went well. What broke was the cadence, at exactly the point everyone stopped watching.

This piece is published from the earlier VILL build. The full text, its sources and the evidence grade behind each claim are being rewritten against the VILL evidence standard before republication.

Every major insight has to say what we know, where it came from, what it means, what a leader should do — and what we still don’t know.