Critically Discuss the Use of the Scientific Method in Psychology This essay examines the advantages and disadvantages of using a method primarily for gathering research on human subjects that can be examined for later use. It will give a basic outline of the methods of investigation, their uses and their suitability. I will also look at the scientific method as a whole and examine the criticisms of this method using the writings of Hume and Popper. The first method I will look at is the rt method which is built upon collected data from surveys etc. Its main plus points being that it uses a much larger sample than the other methods because it takes less time to coll