@ Hameed - I think you completely misunderstood what I said. I gave the examples of muzzling, caging as being as INEFFICIENT as prong collars, or any other training technique which uses force and coercion, etc.
I know for a fact that reward based motivational training and the clicker technique work most efficiently - not only in order to train pet dogs but also assistance dogs, sniffer dogs, and even for agility training dogs.
@ Gopal - Respect needs to be earned. True respect when earned, never results in fear/ stress in anyone. You might want to read some latest discussions and reports being conducted by Behaviorists across the UK and US. Its being argued that "pack leaders" almost NEVER show aggression as a means to ensure their position. That the "pack leaders" in fact are very calm, and of course very skilled - in order to provide protection, food security and maintaining order in the pack.
Please understand that reward based training uses food treat, praise, pat, play to motivate the dog NOT only food. The design in which you give any or all of the above rewards is scientifically proven, I know it works.
None of the programs I give out have any element of force in them, and I deal with families who are highly stressed themselves because their dog is misbehaving and acting out. I have seen my programs show positive results without use of any force.