EAM.9:5 - Archetypal Grounding

For D alone, the constructed five-year present costs are €5.079707 million for the supported continued-use policy and €3.567767 million for replacement. With equal required service, applicable technical support and resources for either, the practitioner recommends replacement on cost: the difference is €1.511940 million.

Keeping replacement inputs fixed, continued use becomes equally costly at about €0.669861 million annual cost. A justified range of 0.95–1.05 does not reverse the answer; a credible 0.60 estimate would. The calculation identifies a potentially useful inquiry boundary without giving that lower estimate a probability or treating it as fact.

At the portfolio scope, the same D replacement needs capital that C modification and other work also need. EAM.10 compares the whole combinations. The independent D comparison is not wrong; its resource assumption differs from the shared decision.

In a separate constructed choice, three policies are technically supported and affordable. The service mandate permits up to six hours of planned interruption for the same users in the same work window. All three meet that condition; their only material preference differences on the supplied five-year basis are:

R is dominated: P costs less and interrupts service for less time, and Q also improves both consequences. P and Q remain: P is cheaper, while Q avoids three more hours of interruption for an additional €0.4 million in present cost. The infrastructure committee is authorized to choose within the mandate, but no priority between these two consequences has been supplied. The practitioner returns P and Q with that specific trade-off for the committee’s decision. Inventing monetary weights for the interruption would conceal the unresolved preference. If a changed mandate permits only two hours, P becomes ineligible and Q is the sole eligible policy on these premises.