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Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.16.MR:2 - Problem

An instrument display, test outcome or log value is produced by a procedure. Its meaning depends on that procedure and on the conditions in which the property is sought. Substituting the display for the sought value can therefore answer a different question.

A correction copied from another arrangement can also fail. Its sign, magnitude and uncertainty depend on the relation that produced it. Unknown influences can leave multiple compatible values even when the displayed number is stable.

The working difficulty is to construct enough of that relation to interpret the indication for the intended use, without modeling every possible influence or assuming that a familiar formula applies unchanged.