Banded frequencies instead of a fixed arrangement
A schedule written for a single headcount will be wrong within two months on a project site. Banding it removes that problem: a stated arrangement for up to a certain number on site, another for a middle band and another above it, each priced at the outset. A change in headcount then moves the schedule to the relevant band without a new negotiation.
The bands should be defined around what actually changes rather than around round numbers. Amenity load, crib room use and consumable draw are the drivers, and they tend to shift at particular thresholds where a facility stops coping. Setting the bands at those points makes the arrangement responsive to the real constraint rather than to an arbitrary figure.
