MA.Preface:6 - Sources, qualifications and changed conditions

Internal and externally required accounts serve different uses. An account must retain capacity thresholds and the acquisition or scale assumptions that change its resource and monetary consequences. Changing an expectation is distinct from deciding about resources. Cost models remain useful when their meaning fits the receiving decision. Revenue uncertainty calls for warranted scenarios; unit economics, ROI and ROMI need their actual definitions and cannot be treated as interchangeable labels.

IMA’s managerial-cost-model guidance contributes resource dependencies and a use-driven choice of model detail. Bragg and Caspari supply historical constraint-accounting cases that expose the difference between assigned cost, capacity and changed payments. The relevant TameFlow capacity distinctions are used with adequate OPS operating results; elapsed flow time alone does not identify the constraint.

Bogsnes and the continuing Beyond Budgeting principles shape MA.5–6’s separation of expectation, ambition and resource allocation. The wider organizational proposal is an alternative whose value depends on the actual problem. Forecasting: Principles and Practice supplies the construction and qualification of missing forecast inputs in MA.5. ACCA’s intermediate-account and life-cycle explanations support the changed-composition and product-time constructions in MA.7–8. The customer-model sources used in MA.8 qualify population, horizon and continuation assumptions. Their contribution is to avoid an unwarranted universal formula, not to require every account to adopt one predictive model.

Use the source qualifications in the relevant pattern when adapting its method. Reopen an affected account when actual resource behavior, contract terms, reporting rules, population or decision use changes.