The German ZEW Economic Expectations report is considered as a leading indicator of Germany’s economic health.
It features a number which basically measures the outlook of investors and economic analysts for the next 6 months. The calculation of which is based on a few factors such as industry growth, sentiment, interest rates, etc.
The baseline figure is 0.0. A reading above it indicates optimism while a negative reading implies a gloomy outlook.
[http://bit.ly/dmsVrV Centre for European Economic Research: German ZEW]