 A ọnụ ọgụgụ kasị elu nime mgbanwe site na mbụ na nke abụọ oge na nnyocha e mere nnyocha bụ Groves and Kahn 1979 , nke na-eme ihe ọmụma zuru ezu isi na-isi tụnyere netiti a ihu na ihu na ekwentị nnyocha e mere. 