C.29.BB:4.6 - Preserve the balance in a computation and return its result

When implementing a partitioned calculation, represent a shared transfer consistently on both sides. Use the same orientation, interval and quantity conversion. Recover total amounts with the appropriate cell volumes or population weights before comparing them.

Derive the aggregate change from the proposed updates. If a numerical approximation changes the balance, determine whether the discrepancy fits the receiving use or repair the update. Balance preservation addresses one property of the computation; accuracy of the local solution requires its own approximation argument.

Return the total, bound or identified missing contribution with the quantity, boundary and assumptions needed to use it. A subsequent question about a local maximum, delay or possible action may require the retained component account. Keep that account available rather than treating the total as a substitute for every question.