Introductory classical physics courses strongly encourage students to develop a perspective that can be described as being a pragmatist; from this perspective, any given motion can be utilized to determine its future physical properties. Such an approach can be very problematic for the students who take introductory quantum physics courses since above perspective can be very destructive for the development of newer and more abstract ideas. The present study investigates college students' conceptual understanding of selected concepts of quantum physics. This paper is a follow-up investigation of previously published dissertation . The results of the study indicated that students struggle to develop quantum thinking because of their preceding perspective to the physical world and it is extremely hard to dispose of classical thinking and evolve it into quantum thinking. Also, data implement is shown to be effective to be utilized for the data collection in this purpose.