Introduction: A 10 minute presentation on brachial plexopathies, focusing on clinical patterns as well electrodiagnostic patterns. Small group active learning: Learners will rotate between 4 stations (20 minutes each). Each station will have a faculty preceptor as well as a laptop with an electrodiagnostic case built into an interactive powerpoint-based application. Cases will represent real-life presentations of brachial plexopathies and/or mimics. With guidance from the preceptor, participants will sequentially select the components of the electrodiagnostic exam (NCS and muscles for EMG), clicking on appropriate studies with the data appearing in real time. Participants will actively discuss the choices, interpret the data aloud in real time and design the study, with faculty preceptor guidance to steer the discussion. In summarizing each case, the faculty preceptor will emphasize key electrodiagnostic features and how to design the study to adequately evaluate these. He or she will address interpretation of borderline or atypical findings, and discuss which features to highlight in the electrodiagnostic report.