Cumulative Record. Chapter 23: Current Trends in Experimental Psychology. Quote 6

Correlational techniques have been extensively used in pure research, and the reason they have dominated the science of psychology in its application to education, industry, public affairs, and elsewhere is not that the processes to be dealt with in those fields are of any special nature, but that it has generally been impossible to give an account of relevant factors in any other way. (p. 344)