*51%*:**Exploring Student Understanding of Energy through the Quantum Mechanics Conceptual Survey***50%*:**Measuring Conceptual Change in College Students' Understanding of Lunar Phases***49%*:**Conceptual Understanding of Quantum Mechanics: An Investigation into Physics Students’ Depictions of the Basic Concepts of Quantum Mechanics***46%*:**Testing the development of student conceptual and visualization understanding in quantum mechanics through the undergraduate career***46%*:**The Influence of Student Understanding of Classical Physics When Learning Quantum Mechanics***46%*:**Changing Scientific Reasoning and Conceptual Understanding in College Students***46%*:**Student understanding of potential, wavefunctions and the Jacobian in hydrogen in graduate-level quantum mechanics***45%*:**Assessing and improving student understanding of quantum mechanics***43%*:**Conceptual and Mathematical Barriers to Students Learning Quantum Mechanics***42%*:**Student Difficulties in Understanding Probability in Quantum Mechanics***42%*:**Improving student understanding of addition of angular momentum in quantum mechanics***41%*:**Improving Students' Understanding of Quantum Mechanics***41%*:**Improving students’ understanding of quantum measurement. I. Investigation of difficulties***41%*:**Investigating student understanding of basic quantum mechanics in the context of time-dependent perturbation theory***40%*:**Improving Students' Conceptual Understanding of Conductors and Insulators***40%*:**Comparing Student Conceptual Understanding of Thermodynamics in Physics and Engineering***39%*:**Probing students' understanding of some conceptual themes in general relativity***39%*:**Enhancing College Students' Understanding of Lunar Phases***39%*:**Analogous Patterns of Student Reasoning Difficulties in Introductory Physics and Upper- Level Quantum Mechanics**