The transition between the second and third eras of survey research has not been completely smooth, and there have been fierce debates about how researchers should proceed.
Ukushintsha phakathi kwe-second and third eras zocwaningo zophenyo akuzange kube bushelelezi, futhi sekube nezingxabano ezinzima mayelana nokuthi abacwaningi kufanele baqhubeke kanjani.