Of all the Japanese martial arts ju-jitsu contains the most variety, is the most amorphous and is the least organized. The main reason for this is that unlike karate, aikido and judo, which all have a modern 'father' or founder, ju-jitsu has none. Some of these ryu died out while others have continued up to the present day. Today the ju-jitsu techniques taught in any particular club depends mainly on the training of the instructor. In one club you might find people training very traditional techniques while others are focusing on modern self defense.
Some clubs practice the use of traditional Japanese weapons like katana, bo, etc.
This book, like the others in this series comes highly recommended. Robert Clark is one of the biggest names in British ju-jitsu. Since he was one of the first on the scene in the UK it has had a great influence. This book provides a solid foundation for any jitsuka. Instead, it presents the material in an easy to read format that accurately describes the action in the photographs.