Habit book notes · Roy F. Baumeister & John Tierney · 2011

Willpower — the big ideas

Willpower as a limited resource that can be used up and trained — an account built on ego-depletion research that later replications challenged.

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Presents willpower as a limited resource that can be depleted and strengthened, based on ego-depletion research, with advice on managing self-control.

The big ideas

Willpower as a resource

Self-control is described as drawing on a limited supply that tires with use.

Build habits to save willpower

Routines reduce how often you need to exert self-control.

Plan around depletion

Schedule demanding choices for when you’re fresh.

Key concepts

• Ego depletion
• Self-control
• Routines
• Decision making

Limits

• The central ego-depletion finding shrank dramatically in large replications — the battery model is not settled science.
• The practical advice to rely on routines and reduce decisions remains sensible, for other reasons.

What the research says

• Baumeister, Bratslavsky, Muraven & Tice (1998) — The original “ego depletion” studies: after one act of self-control, people persisted less on a second task, which the authors took as evidence that willpower draws on a limited resource. Limits: Large later replication efforts found the effect much smaller than claimed, or close to zero — see Hagger and colleagues, 2016.
• Hagger, Chatzisarantis, Alberts, Anggono, Batailler, Birt and colleagues (2016) — Twenty-three laboratories ran the same pre-registered ego-depletion experiment. The combined effect was close to zero. Limits: It tested one version of the procedure; researchers still debate whether other versions show an effect.

Apply this idea

Remove three decisions from the time of day when your habits usually slip — without assuming your willpower has “run out”.

Described in our own words with the source named — not a summary of the whole book.