Skip to main content
Chapter 23 · 0.5 min · from Principles

Constantly train, test, evaluate, and sort people

Chapter summary from Principles by Ray Dalio.

More by Ray Dalio

People improve through feedback loops, not vague encouragement. Training builds skills, testing reveals gaps, evaluation makes performance explicit, and sorting places people where they can succeed.

This requires clarity about standards. If expectations are soft, evaluation turns political. If expectations are clear, evaluation becomes information. The goal is to match responsibilities to capability.

Sorting sounds harsh until you see the alternative: keeping people in roles that don’t fit, where they feel constant failure and the organization absorbs constant cost. Honest sorting can move someone into a better match—or out of a system where mismatch will only grow.

The loop must be continuous. People change, roles change, and new pressures expose new strengths and weaknesses. When the loop is constant, growth becomes normal and stagnation becomes visible.

A 30-second summary — and that's the point. Read Stacks chapters are deliberately short. The full Principles edition has the examples, the longer argument, and the moments worth re-reading. If this resonated, the Amazon link below buys the actual book and supports the author.

One chapter a week — curated, not algorithm-picked.

If this resonated, the free weekly Read Stacks email sends one curated 4-book stack with the chapter we'd open first. No spam, unsubscribe anytime.

No spam. One email per week. Unsubscribe anytime.

Read this chapter in context

Principles is part of this curated reading patheach pairing it with 3 other books that sharpen the same idea:

From Read Stacks · Learn

If you just read a chapter summary…

You're using the navigation tool the way it was designed to be used. Two short essays on the meta-skill — what summaries actually preserve, and the six retention techniques that decide whether what you just read is still useful six months from now.