Abstract
In recent years, the rate of refusal to research cooperation appears to be increasing in the field of psychology. Hence, this paper aimed to examine the actual state of research cooperation by comparing journals of psychology published in 2006 and 2016 with regard to the procedures for collecting research collaborators and the rate of cooperation acceptance. The results suggest that most journals did not have a description on procedures that gathered research collaborators, and the actual condition of refusal to research cooperation was not clarified. On the basis of these considerations, the problems posed by refusal to research cooperation were examined and a method to secure research collaborators to gather as many biased data as possible was proposed.