This volume highlights aspects and approaches to questions on the development and findings of biotic indicator (systems), considering the complex problems of conversion into practice. Biotic indication in relation to sustainable land use and biodiversity is discussed from many angles. Covered in this volume are the following topics: Political requirements and statements on biotic agri-environmental indicators; Requirements regarding agri-environmental indicators from a scientific as well as an applied point of view; Scientific reviews and critical discussions of "state of the art" knowledge regarding several kinds of agri-environmental indicators for biodiversity and/or sustainable agriculture; Original experiments on certain aspects regarding indication of biodiversity in agroecosystems; Practical experience with the application and suitability of agri-environmental indicators (as far as they are already established); Conceptions and models to show the economic effects and possibilities of practical application of such indicators.