Students typically experience a sequence of required
courses. These
courses are generally taught by different instructors with different
pedagogical strategies and in some cases different emphases on what
students should know and how they should know it. However, there are
few published studies on the impact of the switching course type on
learning outcomes. In this report, we use a unique research opportunity
that allows us to investigate a two-semester course sequence in organic
chemistry where both traditional and transformed courses were taught.
We followed students over two semesters in both the transformed and
traditional courses to characterize (1) students’ use of mechanistic
arrows to predict products and (2) how students constructed causal
mechanistic explanations for simple SN2 reactions. Here,
we report how students who switched course type from the first to
the second semester accomplished these tasks compared with their peers
who took the same approach for both semesters. At the end of the course
sequence, we find that students who switched course type performed
similarly to their peers in the course type into which they switched.
In particular, students’ use of arrow pushing and mechanistic
reasoning decreases when they switch from a transformed course where
mechanistic reasoning is emphasized compared to the more traditional
course. It appears that students adapt to the course culture and assessment
strategies used in each course type, resulting in an apparent loss
of learning gains associated with the transformed course. This suggests
that systemic change cannot be accomplished in a fragmentary fashion;
a more coordinated and coherent approach is necessary if improved
learning outcomes are to be attained and reinforced.