Malire a ziwerengero za zolakwika omwe amagwiritsidwa ntchito poyendera potenga zitsanzo kuti asankhe ngati gulu la katundu lilandiridwe.
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AQL (Acceptance Quality Limit) ndi njira yopangira chisankho pa gulu la katundu wopangidwa kutengera zitsanzo zosankhidwa mwachisawawa m'malo moyang'ana chilichonse. Imachokera pa miyezo monga ISO 2859-1 ndi ANSI/ASQ Z1.4.
Kukula kwa gulu ndi mlingo wosankhidwa wa kuyendera zimatsimikiza kukula kwa chitsanzo. Zolakwika nthawi zambiri zimagawidwa kukhala zoopsa kwambiri, zazikulu ndi zazing'ono, chilichonse ndi malire ake olandirira. Ngati chiwerengero cha zolakwika mu chitsanzo chapitirira malire, gululo limakanidwa kapena kuunikidwanso.