Nke ọzọrịlẹ na nke functioanality na mpuru nkata ga-eme sitee mkpa mmirisi nkata. Mmirisi a bụ ndị na-anachaputa ka ọ bụla mkpa mmirisi na payloads, na-akwado, na-agba, na-echeta na-akpọ na-akwado. Nke environment (n'ede na n'aka), temperature, capacity, na nke akwukwo edemede na-eme ihe mmirisi nkata maara. Nke efu efu na nke otu otu material handling ga-adị ka nke mmirisi ndị na-anachaputa na-eme ihe nke traction, stability, na maneuverability.