This is a brilliant crystallization of the vast #productivity literature into 3 schools by (crediting crediting ).
The newest addition--kind of an offshoot from energy but distinct--is:
4. The Mood School
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There are 3 schools of productivity:
1. The Focus School
2. The Efficiency School
3. The Energy School
@fortelabs breaks down each of these schools in his book Extend Your Mind:

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