Hence, i t is quite possible that some of the comments may turn out to be inappropriate or else they have already been taken care of in the f u l l texts. In a couple of cases~ I had the benefit of reading some e a r l i e r longer related reports, which were very helpful. All the papers (except by Sangster) deal with either knowledge representation, particular types of knowledge to be represented, or how certain types of knowledge are to be used.