Isihlukanisi sesigaba ezintathu esivundlile esivundlile esivundlile

Isihlukanisi sezigaba ezintathu siyingxenye eyisisekelo yesistimu yokukhiqiza uphethiloli, esetshenziselwa ukuhlukanisa uketshezi olugciniwe ku-oyili, igesi kanye namanzi. Bese lokhu kugeleza okuhlukanisiwe kuthuthwa kuye ezansi ukuze kucutshungulwe. Ngokuvamile, uketshezi oluxubile lungabhekwa njengenani elincane loketshezi u-A noma/kanye negesi u-B olusakazeke enanini elikhulu loketshezi u-C. Kulesi simo, uketshezi oluhlakazekile u-A noma igesi u-B lubizwa ngokuthi isigaba esihlakazekile, kanti uketshezi olukhulu oluqhubekayo u-C lubizwa ngokuthi isigaba esiqhubekayo. Ekuhlukaniseni uketshezi lwegesi, ngezinye izikhathi kuyadingeka ukususa amaconsi amancane oketshezi u-A no-C enanini elikhulu legesi u-B, lapho igesi u-B kuyisigaba esiqhubekayo, kanti uketshezi u-A no-C kuyizigaba ezihlakazekile. Lapho uketshezi olulodwa kanye negesi kucatshangelwa ukuhlukanisa, kubizwa ngokuthi isihlukanisi sezigaba ezimbili noma isihlukanisi segesi uketshezi.