Ukusetshenziswa okulungile nokugcinwa okudingekayo komshini, ukugcina uwoyela ehlanzekile, kungavimbela ngempumelelo ukwehluleka kwephampu kawoyela kanye nomshini, kunwebe impilo yesevisi yengxenye ngayinye yomshini, kuthuthukise ukusebenza kahle kokukhiqizwa komshini, nokudala umnotho omkhulu. izinzuzo.