The two main tools are the Electronic Data Interchange (EDI) system and the Electronic Single Window (ESW). The EDI allows trade-related documents to be transferred electronically, while the ESW is more extensive and allows trade stakeholders to submit documentation and other information through a single point of entry to complete customs procedures. Figure C.4 depicts the variation in regional adoption of EDI and ESW systems. While many countries now use EDI systems, the use of single windows lags far behind across regions.