Affordability - Based on calibration, repair and replacement costs.

Capability - Based on outdoor use, information transmission, throughput, flexibility of configuration, and the ability to subtract background.

Deployability - Based on durability, power source, preparaition time, manpower requirements, air transportation, and case/storage.

Maintainability - Based on cleaning/decontamination, routine maintenance and ease of calibration.

Usability - Based on simplicity/user friendliness, display readout, safety, buttons/switches. alarms and training time.