Graham system, Graham-Pitman affected Takusari. And Lindsley gave influence to Kuroiwa.
After invention of Takusari system, to add high-speed performance has been the most important subject for practical use, Researchers of graphic shorthand improved vowel signs.

How many syllables can carry on a single stroke? It is coding technology.
How can you write elegantly flowing script? It is ergonomics.
How can you read correctly with omitting sounds and word in context? It is decoding technology based on semantics.
In Japan, Shorthand Basic Alphabet was progressed from double actions, Semi-double actions and Single action.
Where Geometric Japanese think simple visual appearance is most rationalized basic alphabet.