Umda weziphene wezibalo osetyenziswa kuhlolo lweesampulu ukuthatha isigqibo sokuba iqela lemveliso liyamkelwa na.
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I-AQL (Umda Womgangatho Owamkelekileyo) yindlela yokuthatha isigqibo ngeqela lemveliso ngokusekelwe kwiisampulu ezikhethwe ngokungacwangciswanga endaweni yokujonga iyunithi nganye. Isekelwe kwimigangatho efana ne-ISO 2859-1 kunye ne-ANSI/ASQ Z1.4.
Ubungakanani beqela kunye nenqanaba lohlolo elikhethiweyo zimisela ubungakanani besampulu. Iziphene zihlala zihlelwa njengezibalulekileyo kakhulu, ezinkulu nezincinci, nganye inomda wayo wokwamkelwa. Ukuba inani leziphene kwisampulu lidlula umda, iqela liyaliwa okanye liphinde livavanywe.