Training, in general, makes use of commands which are effective tool to communicate with the dog. However the main problem in here is the use of the words. What people don’t understand is that the dog simply can’t comprehend the meanings of the words if not introduced to him well.
So in house training a puppy the trainer has to introduce the meaning of the commands well in order to gain some good results. For example, you could begin with the word “outside” to send him the signal that he should go outside. Then it could be followed by the words “go potty” to make him understand that it is time to eliminate.
Whatever he does after, never fail to praise him (in acknowledgement of a favorable behavior) or punish him for failing to follow the commands. Doing this process repetitively will condition his thinking that when you say the words “outside” and “go potty” you want him to go out of the house to poop.