The book of the Acts clearly gives the Divine method, "Take heed therefore unto yourselves, and to all the flock, over (in) the which the Holy Ghost hath made you overseers, to feed the church of God, which He hath purchased with His own blood" 20.28.

Dalili da aka ba aka ba da sassan yankunan da suka dace wanda masu sayarwa za su iya amfani da su don gudanar da bincike da gwada gwagwarmayar fasahar su da kuma inganta sakon su don sake tabbatar da masu amfani.
