Verbal protocol approach is an important research method in studying managerial decision making. The purpose of this paper is to introduce the verbal protocol approach and the related coding procedures. In the past years, verbal reports have been widely accepted as reflections and evidences of decision-makers' cognitive processes. Scholars may obtain such data through certain research methods such as asking decision-makers to think-aloud. The author will illustrate two studies in order to explain the procedures of implementing this method, share his personal opinions on this topic, and discuss potential difficulties in using this approach.