The evaluation of linguistic theories depends heavily on what kind of data can be regarded as evidence either for or against their hypotheses. The question of what data types linguistic theories use, and which of these types are acknowledged as evidence, is accordingly one of the most fundamental and most widely discussed problems of contemporary linguistics. The aim of this volume is to shed fresh light on this problem by presenting the first findings of a research project. Part I consists of state-of-the-art studies critically analysing current views on the topic. Part II includes case...