This study evaluated the level of agreement between clinicians (experts) and non-clinicians (lay persons) when answering questions and selecting supporting text from ambulatory care encounter notes. The study hypothesized that 1) clinicians would agree more often than non-clinicians across all documents and 2) agreement would be higher for both groups when subjects were asked to find explicit text in documents than when the subjects were asked to draw inferences from the text. The study was designed to shed light on the causes of disagreement among coders of clinical documents.