Rhythm
Maintaining a steady, rhythmic pace.
Suppleness
Stretching through the neck, back and down into the bit.
Contact
Accepting contact of the bit, development of self carriage.
Impulse
The amount of push off or propulsion from the ground, not to be confused with speed.
Straightness
Carriage of the legs, body, neck and head evenly over both sides of the spine.
Collection
Dropping of the hind end and raising of the front end as the horse shifts its impulse to the hind quarters.