The Ching Wu (Chin Woo, and other spellings) was an association of instructors each teaching different systems.
The Ching Wu instructors began all of their students with the same 10 forms practices (including two person sets), such as Tam Tuie and Kung Le Kuen. Those forms were complex in their own right. Tam Tuie, Springing Legs, could be a system on its own.
After completion of the basic study, the instructor would then begin teaching their art, such as Northern Mantis (Tai Tong Long), Northern Eagle Claw (Ying Jow Pai) or other systems.
In that all association members had the same core studies, the group was more than just different systems that hung together.
The groups exists world wide. Schools like the NYC Faan Tzi Ying Jow Pai, originally taught by Shum Leung, still begin their students witj the Ching Wu basics.
bushi no te isshinryu
offering free instruction for 30 years