Reverse Salient
Updated 2026-07-31
INTRODUCTION
English translation pending.
CORE DEFINITION
A reverse salient, a term coined by the historian of technology Thomas Hughes, is the component or subsystem in an expanding technological system that falls behind and limits the growth of the whole, as battery storage does for electric vehicles. Hughes borrowed the metaphor from military salients, where a protruding or weak section distorts the front line. The direction of technical progress is often set by the effort to close that gap, and closing it usually shifts the bottleneck somewhere else.
SCAFFOLDING EFFECT
Reduce cognitive load
- Locate the drag: find the subsystem whose weakness caps overall system performance. - Concentrate effort: direct resources at the bottleneck rather than at the strong components. - Retrack the gap: after breaking one bottleneck, find where the next one has moved.
Anchor fast decisions
A technological system performs only as well as its weakest coupled link, because components must work together. Improving a strong component yields little until the lagging one catches up, so investment flows toward the reverse salient, and once it is relieved the constraint migrates to a new part of the system.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Reverse_salientverified
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