George L.Trager’s The Theory of Accentual System […] offers a rounded system for the most difficult part of phonemic analysis: the prosodemes, chiefly stress, tone, quantity. Trager describes each of those on two scales: the scale of intensity or levels (high, mid, and low tones; loud, medium, and soft stress; long and short quantity), and the scale of contour or movement (falling and rising tone; sustained and uneven stress, etc.).
- Harris (1942b), a pag.242