Regardless of where they lived, people spent a great deal of time developing and perfecting methods of using weapons for defence and fighting. If successful, personal experiences and insights (often gained on the battlefield) help individuals to establish particular "styles," "schools," or "traditions" — in Japanese, the bujutsu ryu-ha.
Compared with the empty-handed fighting arts of neighbouring China and Korea, Japanese jujutsu systems place more emphasis on throwing, immobilising and pinning, joint locking, and strangling techniques. Atemiwaza (striking techniques) are of secondary importance in most Japanese systems, whereas the Chinese ch'uan-fa (kempo) emphasise punching, striking, and kicking.
It is generally felt that the Japanese systems of hakuda, kempo, and shubaku display some degree of Chinese influence in their particular emphasis on atemiwaza, while systems that are derived from a more purely Japanese source do not show any special preference for such techniques, but will use them as and when appropriate
The way an opponent is dealt with is also dependent on the philosophy of the teacher with regard to combat. This translates also in different styles or schools of jujutsu. Because in jujutsu every conceivable technique, including biting, hairpulling, eyegouging etc. is allowed (unlike for instance judo, which does not place emphasis on punching or kicking , only using grappling and throwing tactics) practitioners have an unlimited choice of techniques.
Some teachers will favour taking an opponent out as fast and hard as possible, while others will favour taking an opponent down in a controlled way and then keeping them under control with joint locks. Others, like the Gracie jujutsu system, stress the importance on ground work since most fights end up on the ground anyway, while other teachers find it important to avoid a ground fight at all cost, since it can be very dangerous when faced with multiple opponents.
Although there were and are many ryuha or systems of Japanese jujutsu, there are features that are characteristic of most (if not all) of them.
