Input	Assumption
Facility operations	Each facility offers VL testing services as needed each month for ART clients. The expected number of VL samples to collect each month is based on the total number of patients on anti-retroviral therapy (ART).
	Each facility has an expected quantity of ARVs required each month based on the total number of ART patients.
ARV Origin and Destination	All ARVs are delivered by KEMSA to Lodwar town to be transported to health facilities by facility staff.
VL Sample Origin and Destination	All viral load samples originate at the facility in which they were collected and are transported to a laboratory in Eldoret.
Ground-based transportation	Healthcare workers travel to Lodwar to drop off VL samples and pick up ARVs, incurring costs of the fare for transportation, additional costs for carrying boxes of ARVs back on local transport, and per diem for their time away from their post.
	VL samples are transported from Lodwar to Eldoret using a courier service with an estimated per-package fee.
	Travel times and transportation fare costs for health workers are incurred at a known average for each facility by the Afya project.
UAV Specifications	The UAV has a maximum flight time/distance per tank of fuel and payload capacity in weight and volume.
	The UAV travels at an average speed along a straight-line, uninterrupted path between each origin and destination, and can land/take-off from remote locations to perform reverse logistics.
	The UAV is based in Lodwar.
	The logistics company charges clients only by hours utilized per month for their transport services.