*46%*:**Improving Students' Understanding of Quantum Mechanics***44%*:**Helping Students Learn Quantum Mechanics using Research-Validated Learning Tools***44%*:**Improving students’ understanding of quantum measurement. II. Development of research-based learning tools***42%*:**Improving students' understanding of quantum mechanics by using peer instruction tools***42%*:**Development and validation of a sequence of clicker questions for helping students learn addition of angular momentum in quantum mechanics***40%*:**Using a clicker question sequence to teach time-development in quantum mechanics***39%*:**Improving student understanding of addition of angular momentum in quantum mechanics***39%*:**Investigating student understanding of basic quantum mechanics in the context of time-dependent perturbation theory***38%*:**Improving Students' Understanding of Quantum Mechanics***38%*:**Investigating and improving introductory physics students’ understanding of electric field and the superposition principle: The case of a continuous charge distribution***36%*:**Development, validation and in-class evaluation of a sequence of clicker questions on Larmor precession of spin in quantum mechanics***35%*:**Using student-generated content to engage students in upper-division quantum mechanics***35%*:**From Cartesian coordinates to Hilbert space: Supporting student understanding of basis in quantum mechanics***35%*:**Improving students' understanding of quantum mechanics via the Stern–Gerlach experiment***34%*:**Assessing and improving student understanding of quantum mechanics***34%*:**Improving Students’ Understanding of Quantum Measurement***34%*:**Investigating student understanding in intermediate mechanics: Identifying the need for a tutorial approach to instruction***32%*:**Improving students’ understanding of quantum measurement. I. Investigation of difficulties***32%*:**Enhancing student visual understanding of the time evolution of quantum systems**