The Last Ten Percent Is Half the Journey
Updated 2026-08-22
INTRODUCTION
English translation pending.
CORE DEFINITION
From the Intrigues of the Warring States, the saying holds that a journey of a hundred li counts as half completed at ninety, because the last stage is the most difficult. The core proposition is that effort does not scale linearly with distance or progress: completion costs disproportionately more than the visible progress bar suggests, and risk concentrates near the end. The key qualification is that the saying warns against slackening rather than against starting; its target is the complacency that arrives precisely when success looks certain.
SCAFFOLDING EFFECT
Reduce cognitive load
- Buffer planning: reserve double the resources you expect for the final delivery stage. - Risk repositioning: move scrutiny and attention toward the end rather than the launch. - Progress recalibration: stop reading completion percentage as a measure of remaining effort.
Anchor fast decisions
Early progress is usually made on the easiest parts, so the remaining fraction contains a higher density of difficulty. Integration, review, and delivery also depend on everything before them, so defects accumulate and surface only at the end, when there is no slack left to absorb them. Teams that extrapolate remaining effort from past velocity therefore systematically underestimate the final stage, and the resulting rush is what converts a nearly finished project into a failed one.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E6%88%98%E5%9B%BD%E7%AD%96verified
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