Uyilo linyathelo eliphambili ekuqulunqweni kobumba, inyathelo lokuqala lemveliso, kwaye lilawula yonke inkqubo yokuvelisa. Ke, uyilo nalo lunempembelelo enkulu kubomi benkonzo yokubumba. Uyilo luchaphazela ikakhulu inkonzo yenkonzo yokubumba isitampu ukusuka kwezi zinto zimbini zilandelayo.
Kuba ukusweleka kokubumba okuhlukeneyo kufakwe kumacandelo amaninzi, kwaye itekhnoloji yokuvelisa yobuchwephesha bafa ikwenzile notshintsho oluthile kule minyaka, kule nxalenye, imithetho yoyilo ngokubanzi yokufakelwa kwamachaphaza e-blist iyashwankathelwa.