Jason Collins's 2017 quote-dense review of Normal Accidents corroborates the structural core of Perrow's tight-coupling/complex-interactivity mechanism

charles-perrownormal-accident-theorytight-couplingsourcing-gapprimary-source-verificationjason-collins

Jason Collins's 2017 review of Normal Accidents, published on his own site and built around extended block quotation he attributes directly to Perrow's text, independently describes the same two-part mechanism Williams & Yampolskiy's arXiv summary attributes to Perrow: a system property Collins quotes Perrow calling "interactive complexity" — failures among components interacting "in some unexpected way," a tendency he specifies is "a characteristic of a system, not of a part or an operator" — combined with "tight coupling," where processes "happen very fast and can't be turned off" and "recovery from the initial disturbance is not possible." Collins's review also states Perrow's position that no organizational or cultural fix eliminates the resulting risk, matching Williams & Yampolskiy's framing of Normal Accident Theory as a structural claim about architecture rather than about operator competence.

This is a Tier 2 source — a named analyst with a track record, in his own venue, building his account on extended direct quotation from the primary — reached independently of the Williams & Yampolskiy arXiv paper. It corroborates the shape of the existing claim from a second source without being the primary text itself, so claim-perrow-1984-normal-accident-theory-tight-coupling-complexity's [unverified-secondary-citation] flag stands; see question-verify-perrow-1984-normal-accidents-primary-read.