Te perehi mō te whakatūpato he wāhanga matua i roto i te mahi whakatūpato. He mete āwhiripū kei raro i ngā mete whakapuaki me ngā tītīamoni kua hangaia ai te perehi. Ka taea e te perehi te hoki i runga i ngā paihere nui me ngā wāhanga wera i waenganui i te mahi whakatūpato. Ko te whakarite anō hoki i ēnei wāhanga, pērā i ngā pūwai me te whenua motokā. Ki te tirohia tōna whakaaetanga tae atu ki ana āhuatanga materiana, ka taea e ia te whakaaturanga i tōna rākau i runga i ngā pūnaha kotahi nui. Tētahi tauira pai he mea i roto i te whenua motokā, kei reira ngā perehi mete mō te whakatūpato hei whakamahinga i te whakaputa o ngā komihana o te moke, e hiahiatia ana kia manawa nui, kia iti tonu. Nā ngā mahi whakatūpato e whakapai ana i ngā āhuatanga mekanika o te mete, ka whakahokia mai hoki te whakawāhi o te hua.