Thinking books · Strategy & competition · Carl von Clausewitz, 1832

On War — the big ideas

A dense, unfinished theory of war whose real subject is acting under uncertainty.

Free — no account needed to read

The big ideas

Friction: everything in execution is harder than it looks on paper, and the accumulation of small difficulties is what separates the plan from what happens.

The fog of war — acting on incomplete and partly wrong information — is treated as the normal condition rather than a failure of preparation.

War is the continuation of policy by other means: the means must stay subordinate to the purpose, which is the most commonly violated principle in business too.

The centre of gravity: the one source of strength on which everything else depends. Identifying it is the analytical heart of the book.

Practise it — no need to have read it

Take a plan and list every small thing that could go slightly wrong. Add them up honestly against your timeline.

A hint: Friction is not risk. It is the ordinary accumulation, and it is what makes plans late.

Where it shows up in real life

• Project planning
• Competitive situations
• Any plan that assumes smooth execution

This book is old enough to be freely available in most countries.

Described in our own words with the source named — never quoted, and not a substitute for reading the book.