"...Particular attention must be paid in the attainment of speed and endurance in the dictation class is the matter of adequate shorthand vocabulary.
It is perfectly obvious that a word which is not included in the English vocabulary cannot be part of the shorthand vocabulary. Therefore, the first necessity is that of building up the pupils' English vocabulary.
...the letters and articles dictated in class should be chosen from various sources such as current newspapers, magazines, and actual business letters which should have literary value as well as business value.
Another method of building the shorthand vocabulary is by requiring pupils to keep a vocabulary notebook. Have the book ruled in two columns, the left column being twice as wide as the right... All the important new words encountered... should be written in longhand in the left-hand column and in the right-hand column the shorthand outlines should be written once."
Problems of teaching shorthand in the high school by Ferrari, Marion Elaine