The purpose of this qualitative research is to examine the views of 21 secondary mathematics student teachers attending Mathematical Modelling Course regarding mathematical modelling in a state university in Turkey; reasons why they chose this course and their expectations from the course in question. For this reason, three open-ended questions were asked to the participants and they gave their answers in writing. These questions were related to their description of mathematical modelling, the reason why they chose this course and their expectations related to this course. The data obtained from responses to these questions were examined and categorized using content analysis. Data analysis showed that the participants generally defined mathematical modelling as making mathematical concepts more concrete, developing material, associating mathematics with real world and solving daily life problems. Among participants' reasons why they chose this course, it was pointed out that this course would fulfil the requirements of Secondary School Mathematics Curriculum. Participants' expectations related to this course are retention of mathematical knowledge, making mathematical concepts more concrete and more relevant to daily life; making their future students more active; contributing to their future teaching life. (Contains 1 figure and 3 tables.)