Kev ntim khoom muaj xws li cov khoom ntim cov yeeb yaj kiab thiab cov hnab ntim khoom lag luam, feem ntau yog siv rau ntim cov khoom siv raw hmoov, engineering yas hais, tshuaj raw khoom thiab lwm yam. Lub ntim ntawm cov khoom lag luam yog cov ntim loj loj, uas muaj cov kev xav tau siab ntawm kev ua haujlwm ntawm kev thauj khoom, kev thauj mus los thiab kev ua haujlwm tsis zoo.