Umbhobho wombhobho we-Wotld ye-WOLD yenzelwe ukuba ibe yi-Wels kwisiphelo se-(s) yokuqhagamshela umbhobho (s) kunye kwaye ivumela utshintsho kwicala okanye isebe okanye lisebe.
Oku kufanelekile ke kube yinxalenye yenkqubo yokuthutha ulwelo (ioyile, igesi, isitya, iikhemikhali, ...) ngendlela ekhuselekileyo nefanelekileyo.