Ngenxa yezindleko eziphakeme zezinto zokusetshenziswa ezinkuluukuthethelelwa, kanye nenqubo yokukhiqiza, uma kwenzeka iziphambeko, zizothinta ukucubungula okulandelayo noma ikhwalithi yokusebenza kabi, futhi abanye bathinta ukwenza impilo yezinsizakalo eziqediwe, ukuphepha engozini. Ngakho-ke, ukuze uqinisekise noma uthuthukise ikhwalithi yeukuthethelelwa okukhulu, ngaphezu kokuqinisa ukulawulwa kwekhwalithi inqubo, thatha izinyathelo ezifanele zokuqeda ukuvela kweukuthethelelaUkulimazeka, kepha futhi kufanele kufezeke ukuhlolwa kwekhwalithi okudingekayo, ukuvikela inqubo elandelayo ngomthelela omubi ekusebenzeni kweziphambeko zeukuthethelelwaukugeleza kwinqubo elandelayo. Ngemuva kokuhlolwa kwekhwalithi, izindlela zokulungisa nazo zingayiswa ezingxenyeni ezakhiwe ngohlobo lwezinkinga kanye nezinga lethonya ekusetshenzisweni, ukuze bahlangabezane nezindinganiso zobuchwepheshe noma izidingo zokusebenzisa.
Ngakho-ke, ukukhongela ukuhlolwa kwekhwalithi ngomqondo othile, uhlangothi olulodwa lokulawulwa kwekhwalithi okwenziwe, ngakolunye uhlangothi ukukhombisa indlela yokwenza ngcono kwinqubo yokwakha, ukuze iqinisekise ukuthi ikhwalithi yokukhokhiswa ihlangana Izidingo zezobuchwepheshe amazinga ezobuchwepheshe, futhi ahlangabezane nezidingo zokwakheka, ukucubungula nokusebenzisa.
Ukuhlolwa kwekhwalithi kokuthethwa okukhulu kufaka phakathi ukuhlolwa kwekhwalithi yokubukeka nekhwalithi yangaphakathi. Ukuhlolwa kwekhwalithi ukubukeka ikakhulukazi kubhekisa ekuhlolweni kosayizi wejometri, ukwakheka, isimo esingaphezulu nezinye izinto zokwakha; Ukuhlolwa kwekhwalithi yangaphakathi ikakhulukazi kubhekisa ekuhlolweni kokuqanjwa kwamakhemikhali, ukwakheka kwe-macroscopic, ukwakheka kwemicroscopic kanye nezindawo zemishini zokwenziwa kokwenziwa kwemishini.

NgobaukuthethelelwaIzingxenye ezenziwe, ukusatshalaliswa kwengcindezi enqubweni yokusebenzisa, isimo esibalulekile, isimo sokusebenza sihlukile, izinto zaso kanye nenqubo ye-metallurgy zihlukile, ngakho-ke umnyango ohlukile ngokususelwa kulesi simo esingenhla futhi ngokwezidingo zalo mnyango wamazwe omhlaba uzokuxoxa ukuhlukanisa izigaba, iminyango ehlukene, amazinga ahlukile wokuhlukaniswa kweukuthethelelwazihlukile. Kunoma ikuphi, ngokuhlolwa kwekhwalithi okukhokhiswa okuphezulu okuphelele kuhlukaniswa kusuka ezigabeni ezimbili zokuhlola, okungukuthi, ukuhlolwa kwekhwalithi yokubukeka nekhwalithi yangaphakathi, kepha izinhlobo zeukuthethelelwazihlukile, futhi izinto ezithile zokuhlola, inani lokuhlola kanye nezidingo zokuhlola zihlukile. Isibonelo, eminye iminyango yezimboni izoba ngensimbi ehlelekile, insimbi engenasici, insimbi engasho luthoukuthethelelwaEkilasini le-IV ukuze kuhlolwe, eminye iminyango izoba se-aluminium alloy izizathu nokufa kokwenziwa ngokusengozini yazo ekilasini ukuze ihlolwe, kanti eminye iminyango izoba yi-aluminium alloy, i-alloy yensimbi ye-alloy ibe yi-IV ekilasini le-IV ukuze ihlolwe.