Comment: Use of the octave jump to make the voice less chest oriented and allow for a better register coordination.

Quote: An important preliminary exercise for introducing a factor common to both registers is the octave jump. What this does is to help establish a resonance adjustment which is the same for each of the two registers. At the same time it prepares the way for a realignment of the registers in the area of difficulty by appropriate use of intensity.  (The Free Voice)