ˈʌðɚz fˈiːl ɪɾ ɪz pˈɑːsᵻbəl tʊ ɪfˈɛktɪvli ˈɛstᵻmət ðə wˈɜːkˈaʊɚz ɹˌɛpɹᵻzˈɛntᵻd, ɔːɹ ðə skˈɪl ʌvðə wˈɜːkɚz bˈeɪst ɔnðə nˈeɪtʃɚɹ ʌvðə dˈɛbɪɾɪdʒ.
Others feel it is possible to effectively estimate the work-hours represented, or the skill of the workers based on the nature of the debitage.