Isihlilingi esiyindilinga isihlilingi sokuphakamisa inhloso yonke, esiqinile futhi esingalimazi umthwalo waso.Ilula ngokwedlulele ngesisindo futhi iguquguquka ngokungenamkhawulo kuzo zonke izinhlangothi, kulula futhi kuyashesha ukuyilawula ngisho noma imithwalo emise ngendlela exakile noma entekenteke iphakanyiswa.Kwenziwe ku-EN 1492-2.