His father Mr.Cai Xiyong wished to resolve illiteracy problem in 19 century.
He said;
Chinese Character is one of the most beautiful letter and the most complex letter too.
But mastering Chinese Character perfectly needs many years. There are 40,000 in a dictionary and still increasing. Note taking is very slow because of many strokes in writing.
Therefore he named his book “Zhuan yin Kuai zi” , Speed letter.
His son, Cai Zhang improved father’s letter for Verbatim reporting in the Parliament. This was the first “Chinese Shorthand”