This volume includes about thirty contributions to the 49th Colloquium Biblicum Lovaniense, held in July 2000 in Leuven. The authors represent the contemporary state of the scholarly discussion in Europe and North America on the sayings source Q, in connection to actual problems of the quest of the historical Jesus. The contributions show different positions on the historical and exegetical problems though almost all of them are accepting the Q-hypothesis. Some of the articles are devoted to the text and theology of the Q-source (or Q-gospel) as a whole, others deal with more special questions of the language, or the historical background or context, or the situation of the Q-community. Some of the contributions give interpretations of important particular text-passages, including parables and miracle-stories. The volume gives a good overview of the progress of the discussion and research on Q since the Leuven colloquium in 1981.