Function-Cost Analysis
Updated 2026-08-10
INTRODUCTION
English translation pending.
CORE DEFINITION
A tool at the core of value engineering that assigns every function a user value and an implementation cost, then computes the value-to-cost ratio. Functions with high cost and low value are candidates for improvement or removal, while high-value functions that are underfunded are candidates for investment. The key qualification is that the criterion is the ratio rather than the absolute cost: a cheap function nobody needs is still waste, and a core function starved of resources still damages value. Maintenance cost must be counted alongside build cost.
SCAFFOLDING EFFECT
Reduce cognitive load
- Function listing: enumerate every function the product or process currently performs. - Ratio scoring: estimate user value and full cost for each function and compute the ratio. - Resource reallocation: cut or improve low-ratio functions and fund the high-value ones properly.
Anchor fast decisions
Costs are visible in accounting while value is inferred from user behavior, so decisions drift toward cutting whatever is expensive rather than whatever is useless. Computing the ratio forces both sides onto the same scale, which exposes functions that consume resources without returning value and functions that return value while being starved. Because maintenance costs recur, a function kept for sentimental reasons charges the organization every year it survives.
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/Value_engineeringverified
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