Time-block your ONE thing

Reserve a large, protected block early in the day for your most important work.

Why it works

Important-but-not-urgent work gets crowded out by reactive demands unless it is given protected time first. Blocking a substantial chunk for your ONE thing — ideally early, before the day fills with others’ priorities — guarantees the highest-leverage work happens while your energy and attention are freshest, instead of with whatever scraps remain at the end.

How to do it

1. Block a substantial chunk (often several hours) for your ONE thing, early in the day if possible.
2. Treat the block as an unbreakable appointment and defend it from meetings and requests.
3. Do the ONE thing first, before opening email or reacting to the day.

Evidence

Consistent with implementation-intention and prioritization evidence (scheduling raises follow-through) and with the general productivity principle of doing high-value work before reactive demands accumulate. The specific block size is practitioner guidance. Gollwitzer and Sheeran’s meta-analysis quantifies the effect, finding that pre-committing when and where a goal will be pursued substantially increases goal attainment. (mechanistic)

The "early morning" prescription suits many but not everyone; the durable principle is protecting time for it first, whenever your peak energy is.

Sources

• Gollwitzer & Sheeran (2006), meta-analysis of implementation intentions, Advances in Experimental Social Psychology
• Gollwitzer, P. M., & Sheeran, P. (2006). Implementation intentions and goal achievement: A meta-analysis of effects and processes. Advances in Experimental Social Psychology, 38, 69–119.

Common mistake

Leaving the ONE thing for "after I clear the small stuff," so reactive work consumes the day and the highest-leverage task never gets its block.