Lili Cui Department of Physics University of Maryland Baltimore County INVESTIGATING COLLEGE STUDENTS. RETENTION AND TRANSFER FROM CALCULUS TO PHYSICS Most science and engineering majors are required to take calculus-based physics, which makes calculus a prerequisite or co-requisite course. It is not uncommon for physics instructors to claim that their students did not have appropriate calculus knowledge to help them master physics. What is the nature of this problem? This talk focuses on assessing transfer of learning from calculus to physics. A theoretical framework was proposed to assess students' transfer of learning in the context of problem solving. Two kinds of transfer - horizontal transfer and vertical transfer - were identified. Horizontal transfer involves applying previously learned ideas in a problem. Vertical transfer involves constructing new ideas to solve the problem. Students need to employ both horizontal and vertical transfer when they solve any problem. Both quantitative and qualitative methods were used to examine transfer in the context of problem solving. I will focus on qualitative study in this talk. A detailed understanding of students' difficulties in terms of the theoretical framework is provided. I will also discuss instructional strategies that may facilitate the transfer from calculus to physics.