*47%*:**Investigating student understanding of the stationary state wavefunction for a system of identical particles***28%*:**QuVis: Non-interacting Particles in a 1D Infinite Square Well***26%*:**Student difficulties with quantum states while translating state vectors in Dirac notation to wave functions in position and momentum representations***26%*:**Advanced students’ and faculty members’ reasoning about the double slit experiment with single particles***23%*:**STP Textbook Chapter 6: Many Particle Systems***23%*:**Wave-particle duality and uncertainty principle: Phenomenographic categories of description of tertiary physics students’ depictions***22%*:**Student difficulties with complex numbers***22%*:**Quantum Mechanics: Identical Particles***21%*:**Student understanding of the wave nature of matter: Diffraction and interference of particles***19%*:**3D Simulations of Interacting Particles***19%*:**Student understanding of the angular momentum of classical particles***18%*:**Improving students’ understanding of quantum measurement. I. Investigation of difficulties***18%*:**Observations on student difficulties with mathematics in upper-division electricity and magnetism***18%*:**Student difficulties with representations of quantum operators corresponding to observables***17%*:**Classical Dynamics of Particles and Systems***17%*:**Student Difficulties in Understanding Probability in Quantum Mechanics***17%*:**Students' Difficulties with Quantum Measurement***17%*:**Students' Difficulties in Interpreting the Torque Vector in a Physical Situation***17%*:**Upper-division student understanding of Coulomb's law: Difficulties with continuous charge distributions**