The Viable System Model (VSM) has been used for more than five decades to diagnose and design organizations under conditions of complexity. Its durability is often treated as evidence of its power.
Yet the model’s applications rarely specify in advance what observation would count against a diagnosis, which rival account would perform better, or what result would require the model or its practitioners to relinquish a claim. Exposure of the model to evidence has been attempted: at least one explicitly Popperian empirical test exists, as do a documented adversarial exchange in print and two audits of testability in the cybernetics literature.
This paper argues that the principal methodological problem facing VSM scholarship is therefore not the absence of criticism or even of testing, but the absence of accumulation: declared adverse results have been absorbed by reinterpretation rather than recorded as losses, and the tradition cannot say whether it is progressing or degenerating.
Our contribution is a protocol for converting criticism and testing into a cumulative research programme, built on five elements: a bounded claim, an evidential basis, a discriminator, a minimum feasible test and its cost, and a revision rule fixed before the result is known. Applied retrospectively to one completed test and prospectively to four further cases, it feeds a public, versioned evidence register whose aim is neither to refute the VSM nor to defend it, but to make the model corrigible: capable of losing specific claims without abandoning the whole framework, and capable of recording when a claim is strengthened by evidence it did not anticipate.