MA.7:11 - SoTA-Echoing

The selected line combines resource-based accounting with explicit numerical decomposition and causal inquiry. Caspari and Caspari’s opening fixture case supplies a historical reason to question local performance readings: a changed activity time can have a different consequence at the system constraint. MA.1 supplies the quantitative model; the applicable inquiry method supplies further evidence when a causal question remains.

ACCA’s flexible-budget treatment develops the reference account at actual activity while retaining fixed and stepped behavior. Its materials mix and yield treatment develops intermediate accounts and the relation of a variance to its subdivisions. That treatment concerns the mix of input materials; §5.2 applies the accounting construction to the mix of output products. The objects and reference requirements must remain explicit.

§§4.1–4.3 separate comparable values, the construction of arithmetic components and supported explanations. The five intermediate accounts expose when an apparent usage problem is fully explained by output mix. Their construction warrants the numerical division, while a cause or responsibility judgement requires further evidence. Reopen the explanation when changed mix, definitions or operating evidence defeats its comparison or cause.