In 1990, Peter Southwood instructed Sifu Waller to start applying his form and palm changes.
No specific guidance was provided.
The internal principles had been taught already and Sifu Waller was a seasoned martial artist in other arts.
Peter simply left Sifu Waller to figure things out for himself.
Sifu Waller returned with a variety of applications and these were corrected.
Over time, the way in which the arts should be applied was suggested by the form(s) themselves, the underlying principles and the physics.