This report examines the differences in the trade data from the two nations in two ways. First, it compares the trade figures using the Harmonized Commodity Description and Coding System (Harmonized System) to discern any patterns in the discrepancies between the U.S. and Chinese data. The second approach to examining the differing trade data involves a review of the existing literature on the technical and non-technical sources of the trade data discrepancies. This report is updated annually, after the release of official trade data by China and the United States.