Manipulation of text by means of the computer is well-established. Everybody has a word processor on his or her desk, and electronic mail, desk top publishing, text interchange languages, hypertext and multimedia are technologies many will be aware of.<BR>However, the full potential of the computer for the management and use of textual information has not been tapped yet. Far from it. For this a more principled approach is necessary, which will create a framework on which existing technologies, and technologies-yet-to-come can build and in which they can be integrated.<BR>This book can be seen as one step on this road. It employs the experience gained in working with a rich electronic linguistic corpus, the ECA database. A basic text database model is put forward and several text database retrieval languages are defined and analysed. A clear direction for further research is given.<BR>Therefore, the book is of relevance to researchers and developers in the field of corpus linguistics and in the more general field of electronic text.