*58%*:**Students’ Understanding of Stern Gerlach Experiment***57%*:**Assessing and improving student understanding of quantum mechanics***56%*:**Improving student understanding of addition of angular momentum in quantum mechanics***55%*:**Improving Students' Understanding of Quantum Mechanics***55%*:**Improving Students' Understanding of Quantum Mechanics***49%*:**Improving students' understanding of quantum mechanics by using peer instruction tools***48%*:**Student Difficulties in Understanding Probability in Quantum Mechanics***47%*:**The Influence of Student Understanding of Classical Physics When Learning Quantum Mechanics***47%*:**Improving students’ understanding of quantum measurement. I. Investigation of difficulties***47%*:**Investigating student understanding of basic quantum mechanics in the context of time-dependent perturbation theory***46%*:**Exploring Student Understanding of Energy through the Quantum Mechanics Conceptual Survey***45%*:**Surveying students' understanding of quantum mechanics in one spatial dimension***44%*:**Testing the development of student conceptual and visualization understanding in quantum mechanics through the undergraduate career***44%*:**Surveying Students’ Understanding of Quantum Mechanics***44%*:**Improving Students’ Understanding of Quantum Measurement***44%*:**Improving students’ understanding of quantum measurement. II. Development of research-based learning tools***42%*:**Quantum Mechanics: Stern-Gerlach***42%*:**Student understanding of quantum mechanics***41%*:**Student understanding of quantum mechanics at the beginning of graduate instruction**