Part 1 The big picture: Why bother to catalogue? What to catalogue? Who should catalogue? How to catalogue … and not reinvent the wheel. Part 2 The nitty-gritty: Is it a book, is it a journal? What’s a strange attractor? Cataloguing subjects you know nothing about; Ici on ne lit pas le français: unknown languages and how to deal with them; Special cases; Resources for cataloguers.