  We are investigating cognitive issues in learning quantum mechanics in order
to develop effective teaching and learning tools. The analysis of cognitive
issues is particularly important for bridging the gap between the quantitative
and conceptual aspects of quantum mechanics and for ensuring that the learning
tools help students build a robust knowledge structure. We discuss the
cognitive aspects of quantum mechanics that are similar or different from those
of introductory physics and their implications for developing strategies to
help students develop a good grasp of quantum mechanics.
