 In his opening chapter of all editions of Teach Yourself Dutton Speedwords titled "Dutton Speedwords Analysed" (TYDS, pages 7–9) he describes some of the principles he used.For example, using Horn's analysis of frequently used words to determine how much to abbreviate or truncate his Speedword vocabulary, and, drawing on words common to several European languages.But this does not equate to a systematic account of how new technical words and expressions could be added to the Speedword vocabulary.