Ukuba imephu ikwintwana yephepha okanye kwifestile yekhompyutha, kufuneka ibe icwangcisiwe. Kuba kaloku umhlaba ungqukuva okanye usisazinge kwaye lona iphepha kunye neefestile zekhompyutha zona zisibanca. Zininzi iindlela ezisebenzisa imathematics xa zisenza izicwangciso. Lunye kuphela uhlobo lwemephu yomHlaba olungacwangciswayo lolo luzotywa emoyeni. Olu ke kuthiwa yiglobhu.