Ko te tukanga werohanga kirihou e pā ana ki te rewa o ngā rauemi mata mā te pēhanga, te werohanga, te whakamatao, mai i te mahi a tetahi āhua o ngā wāhanga haurua-oti o te tukanga.

He tukanga hanga tēnei hei whakaputa i ngā wāhanga i roto i te rahinga nui. Ko te nuinga o te wā ka whakamahia i roto i ngā tukanga whakaputa papatipu e hangaia ana te wāhanga kotahi i ngā mano, i ngā miriona rānei wā i te raupapa.

Ka hangaia e tā mātou tukanga werohanga kirihou ngā tauira ritenga me ngā wāhanga whakaputa whakamutunga i roto i ngā rā 15, iti iho rānei. Ka whakamahia e mātou ngā taputapu pokepoke maitai (P20, P20+Ni rānei) e tuku ana i ngā taputapu utu iti me ngā huringa hanga tere.