1) Three Phases of Theory study
Yan Tingchao explained three phases of Theory study.
The first phase is Phoneme, which consists of Sampling sound or sounds for abbreviation and Alternative letter for easy writing.
The Second phase is Writing operation which means Smooth writing in Two-dimensional movements realized of Three-dimensional movements.
The fourth phase is Grapheme, which consists of Basic letters, Alternative letters and new line, Zoning to place letters, Positioning to dot around letters and cursivation.
Yan Tingchao also mentioned Vowels. Chinese improvers tried Vowel symbolization from position signs to consecutive signs for fitting languages.