This Handbook aims to provide an overview of regular survey activities, as well as to show how survey results can be used scientifically in the context of business-cycle analysis and forecasting. - Examples of various business surveys are described in detail, starting with their objectives, the questions they pose, how they are weighted and extrapolated and the representativeness of their results. A detailed scientific examination of the explanatory value of the data is also made in order to demonstrate their potential usefulness. The Handbook has three parts: firstly, it presents the importance of business surveys for empirical research. Secondly, selected surveys are introduced in detail such as the Ifo Business Survey and the Ifo Investment Survey, and thirdly, a broad spectrum of studies on the consequence of the survey results is presented. The significance of the surveys applied equally to business cycle analysis and to forecasting. An array of modern methods of time series analysis and econometric model construction is used in these investigations.