regarding the 24 form.
from what i know, this form was made sometime in the 1960's or 70's as a simplification of the yang long form. cheng man ching also shortened and simplified his teacher's (yang chen fu) form due to his (cheng man ching's) lazy nature (his own admission in a preface to a book he authored--i'm not trying to insult or offend anyone here). value? whatever you put in, you'll get out.
Originally Posted by Lee Chiang Po
You then walk backwards, forcing him off his feet and then drag him by the eye socket and lips. You can pull so hard that the lips tear away. You will never hear such screaming.