In all cases, the use of such procedures involve the consideration of either variables or attributes associated with the item, product, service, customer etc. Variables can be expressed as measures (length, weight, duration etc) whilst the consideration of attributes usually requires some form of classification (good/bad, acceptable/unacceptable, working/not working, pass/fail etc).
Katika matukio yote, matumizi ya taratibu hizo kuhusisha kuzingatia ama vigezo au sifa kuhusishwa na bidhaa, bidhaa, huduma, mteja nk Vigezo inaweza kuwa walionyesha kama hatua (urefu, uzito, muda nk) wakati kuzingatia sifa kwa kawaida inahitaji baadhi ya fomu ya uainishaji (nzuri / mbaya, kukubalika / halikubaliki, kufanya kazi / si kazi, kupita / kushindwa nk).