Beyond Chesterton’s Fence: Institutional Intervention Readiness in Complex Policy Systems

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Abstract

Public institutions are often changed when original purposes are forgotten, present effects have diverged, and dependencies are causally opaque. Chesterton’s Fence warns against removing an inherited arrangement merely because its use is not visible. As a policy rule, however, it can confuse origin with function, function with legitimacy, and caution with continuity. This article develops Institutional Intervention Readiness (IIR), a decision-relative theory of what must be understood before preserving, redesigning, replacing, or removing an arrangement. IIR defines function as an evidence-supported causal contribution within a bounded system and horizon. It separates current function from public-value legitimacy, maps dependency and distribution, tests replacement-function coverage, and evaluates transition controllability. Sufficient understanding is not complete knowledge. It exists when risk-proportionate evidence identifies critical functions and dependencies; separates unlawful or unjust functions from legitimate ones; compares preservation and feasible alternatives symmetrically; covers or safely decouples critical legitimate functions; and makes residual uncertainty decision-immaterial or governable through staging, monitoring, fallback, and recovery. Claim-specific thresholds rise with nonrecoverable downside, while a pairwise warrant subjects preservation to the same harm, cost, and irreversibility profile as intervention. The theory derives ten falsifiable propositions, formalizes for institutional dismantling an established preparedness and invisible-success dynamic, and operationalizes a function-to-capacity form of administrative thinness as a hypothesized small-state boundary condition. IIR complements consequence mapping and option-sensitive decision design.