Yusuf Papers
Durable, researched arguments with explicit status, version and revision history. A paper is revised in place—never reposted.
Human Systems
The body of work.
Written pieces on one question: how should technology fit into human life—and what must products and businesses understand to make that possible? The web edition is canonical; pieces are revised in place.
Five kinds of thinking
Organized by idea, not by date.
Field Notes
Observed behaviour, friction, workarounds and trust moments from the world—captured before they harden into opinion.
Building Notes
Real decisions, experiments, trade-offs and mistakes from building products—what the current work is teaching. (1 piece)
Product Principles
Reusable claims and decision tools another builder can apply without Yusuf in the room—strengthened by multiple evidence sources. (1 piece)
Contradictions
Evidence that weakens, narrows or complicates a current belief. These are never hidden to make the worldview look inevitable.
Latest
Recent pieces.
You Can Build the Wrong Product Correctly
Correctness is measured against the shape you chose, and nothing in a normal build process checks whether the shape was right.
v0.1 · 2026-08-27 · 6 minThe Promise Is Infrastructure
A one-line consent promise on a signup form decided the Scorecard's entire email architecture—and what that says about where promises should live.
v0.1 · 2026-08-26 · 6 minInvestigating a live product? The Product Investigation Field Guide covers the method—gather, examine, resist—in one free email.
The letter