"Useful information" for participants of the IFIP WG 2.4 Meeting in Twente (June, 5-9). Map of the campus of Twente University of Technology is enclosed.

The authors remember their meeting with addressee two years ago in Leiden. They invite A.Ershov to participate in a special issue of journal "International Review of Education" devoted to new information technology in education of different countries. Information materials on this issue are attached.

to reprints sent on the addressee's reguest.

The author thanks for the invitation but now he can not accept it after three months being out of work because of serious operation and not yet full recovery.