In the framework of the colloquia on Machine Processing of Old German Texts held at regular intervals since 1971, the Fifth International Colloquium (March 1997 in Würzburg) concentrated on the use of the new media, corpus-related issues posed by Old German texts, and lexicographic problems in connection with different historical stages of language development. In addition there was discussion of fundamental organizational questions, encoding designs such as the Text Encoding Initiative, and solutions to individuals problems posed by text data processing. The central papers are assembled in this volume.