The DBIX, or German International Business Index, is made up of three key indices from three major economies: the US, Japan and Germany. Deutsche Bank Research experts collate and analyze the structural challenges in the various economic regions. From the US, the source is the Purchasing Manager Index, which surveys 400 leading American companies. From Japan, data comes from the Index of Business Conditions compiled by the Economic and Social Research Institute based in Tokyo. From Germany, the information comes from the closely-watched ifo Business Confidence Survey, which checks the pulse of 7,000 German companies.