A screen capture from the ImageSim learning system used in the study. Shown is the feedback page demonstrating: a the learner’s assignation of where the fracture lies (red marker) which would have been placed by the learner on a prior screen, on an otherwise unmarked radiograph; b three forms of feedback including overall correctness (green checkmark), text of radiologist report, and yellow target area pre-assigned by an expert radiologist. (Color figure online)