*48%*:**Observations on student difficulties with mathematics in upper-division electricity and magnetism***48%*:**Using student-generated content to engage students in upper-division quantum mechanics***47%*:**A Research-Based Approach to Assessing Student Learning Issues in Upper-Division Electricity & Magnetism***47%*:**Investigating student ownership of projects in an upper-division physics lab course***41%*:**Upper-division student understanding of Coulomb's law: Difficulties with continuous charge distributions***40%*:**Revealing Differences Between Curricula Using the Colorado Upper-Division Electrostatics Diagnostic***40%*:**Investigating how graduate students connect microstates and macrostates with entropy***39%*:**Investigating Student Understanding of Perturbation Theory and the Inner Products of Functions***39%*:**Student Learning In Upper-Level Thermal Physics: Comparisons And Contrasts With Students In Introductory Courses***39%*:**Multiple roles of assessment in upper-division physics course reforms***39%*:**Investigating Student Difficulties with Time dependence of Expectation Values in Quantum Mechanics***39%*:**Upper-Division Students' Use of Separation of Variables***39%*:**Characterizing and monitoring student discomfort in upper-division quantum mechanics***38%*:**Upper-division students' difficulties with AmpĂ¨re's law***38%*:**Analytic framework for studentsâ€™ use of mathematics in upper-division physics***38%*:**Student Ideas around Vector Decomposition in the Upper Division***38%*:**Investigating the Relationship between Active Learning Task Characteristics and Student Success***38%*:**Assessment feedback: A tool to promote scientific practices in upper-division***37%*:**Problem-based learning in upper division courses: Student successes, perceptions, and reactions**