Schooling "mandates" a give and take dialogue between horse and rider.
"When you make your horse submissive, you break the spirit, and when the spirit is broken, the flame of passion is darkened. Passion is the desire to perform, passion is the will be magnificant." (c) E. A. Buck 2010
When you ask yourself which clinician do I choose to partake of, one must ask themselves this:
Does the methodology presented 'train' the horse through submission, domination, physical and psychological control?
Does the methodology presented 'school' the horse through patience, lack of force, lack of domination, lack of submission, and with the least amount of physcial and psychological control?
Does the clinician use "tools" to actually "manipulate" the horse, or does the clinician use only his voice first and foremost, with the body only being an enforcement of the words?
In other words, does the clinician "actually" school the horse with total respect and "allow" the horse to demonstrate respect for the clinician?