1. Gukoresha ibikoresho bishya - iki gicuruzwa nibyiza gutunganywa nibikoresho bishya, bikanga gukoresha ibikoresho bya kabiri, kandi byizewe gukoresha
2 Urukuta rw'imbere rworoshye - coefficient de fraisse nkeya, guterana gake kuruta imiyoboro y'icyuma
3 Umuyoboro wuzuye - uburyo bwo gukora cyane, ubuzima bwa serivisi burambye hamwe nubwiza bwizewe