*59%*:**Assessing and improving student understanding of quantum mechanics***59%*:**Improving student understanding of addition of angular momentum in quantum mechanics***56%*:**Student Difficulties in Understanding Probability in Quantum Mechanics***56%*:**Deeper look at student learning of quantum mechanics: The case of tunneling***56%*:**Investigating student understanding of basic quantum mechanics in the context of time-dependent perturbation theory***55%*:**Student difficulties in learning quantum mechanics***55%*:**Exploring Student Understanding of Energy through the Quantum Mechanics Conceptual Survey***53%*:**Improving students’ understanding of quantum measurement. II. Development of research-based learning tools***52%*:**On the Study of Student Use of Meta-Resources in Learning Quantum Mechanics***52%*:**Surveying Students’ Understanding of Quantum Mechanics***52%*:**Conceptual and Mathematical Barriers to Students Learning Quantum Mechanics***52%*:**Quantum Mechanics Students' Understanding of Normalization***52%*:**Student interpretations of uncertainty in classical and quantum mechanics experiments***51%*:**Improving Students' Understanding of Quantum Mechanics***51%*:**Surveying students' understanding of quantum mechanics in one spatial dimension***51%*:**Improving students' understanding of quantum mechanics via the Stern–Gerlach experiment***51%*:**Assessing Student Learning in Middle-Division Classical Mechanics/Math Methods***51%*:**Investigating the Influence of Visualization on Student Understanding of Quantum Superposition***51%*:**How social-media and web-accessible learning resources influence students’ experiences in a quantum physics course: A case study**