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Four moves from reading to knowing.

01 · Add

Anything you read. One click.

Articles, YouTube, PDFs, books, your own notes. Send a page from Chrome without leaving it.

stratechery.com/aggregation-theory
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Aggregation Theory
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Source · 2,400 words

Strong product teams start with a clear user problem. They validate demand before investing heavily. This reduces the risk of building features nobody wants. In fast-moving markets, these decisions matter even more. Teams that skip validation waste engineering effort.

Start with the problemValidate before buildingSkipping validation wastes effort
Use · SimulationDecision 1 of 3
The Sales VP escalates in Slack: drop the sprint and build the feature the customer named. Your move?
Agree. The renewal is worth more than the sprint.
Ask what problem it solves, then check it against the roadmap.✓
Decline. Sales doesn’t set the roadmap.
ScheduleNext 30 days
Recall reviewApply practice
Remember
97%
kept high by 5 reviews
Use it
81%
climbing with each scenario

55 ways to ask. Every angle until it sticks.

Why it works
70%

of what you read is gone within a day.

Unless it comes back right before it slips. Each review lands just as the curve starts to fall, and the idea holds.

Without practiceRemember
0% 50% 100% Day 0 Day 20 Day 40 no practice
Try one

Every idea climbs three levels.

Recall unlocks application. Application unlocks judgment. Answer them below.

01 · Know

Can you recall it?

Quick retrieval, spaced out — and always as a situation, never “define this”. Reviews land right before the idea would fade, so it never gets the chance.

Know · ApplyFrom “Never Split the Difference”

A contractor says your deadline is impossible and won’t move. You need them solving it, not defending themselves. What do you say?

Use · ApplyFrom “The Mom Test”

Someone says: “Yeah, I’d love an app that helps me eat healthier.” Your best next question?

02 · Use

Can you use it under pressure?

Scenarios you haven’t seen, built from the idea. A fresh one every time it returns, so you practise transfer, not recognition.

03 · Master

Can you make the call?

Weigh trade-offs, judge a plan, build a framework you could hand to your team. This is where reading becomes a skill.

Master · JudgeExpert rating

A SaaS team moves every customer from flat $99/mo to usage-based pricing next month, no grandfathering. Your verdict?

The science, in writing.

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