Dear Prospective Participant, thank you for expressing interest in participating at the workshop on permutation and matrix group algorithms. The location of the workshop changed: it will take place at the conference center Schloss Dagstuhl, near Trier. Information how to reach Dagstuhl is available at http://www.dag.uni-sb.de The program starts on the afternoon of May 26, Monday, and ends at the evening of Saturday, June 1. Accommodation is provided from Monday evening to Sunday morning, and meals from Monday evening to Saturday morning. In the first three days, a tutorial on permutation group and matrix group computations in GAP will be given, and an introduction to some intricacies of Version 4 of GAP. The program of the last three days consists of research talks. Thanks to Professors Pahlings and Neubueser, we are able to provide accommodation and meals free of charge for the participants. However, at this time, I'd like to ask for a firm commitment of participation, indicating the exact date of arrival and departure. Please respond by **April 13, 1997**. Also, please indicate whether you would like to give a talk (or talks) in the second half of the workshop, with title and the desired length of the talk. Best regards, Akos Seress