|While practicing the violin, try to talk about the good things going on during the practice. It is far better to say, "Now let's see if you can do it even better this time," than it is to say, "This last one wasn't quite a good as you had been doing." I am not saying that I believe in only telling someone good things. What I have experienced, though, is that adverse criticism, no matter how minor, brings about frustration. A frustrated student only makes more mistakes. Besides that, you should never expect practices to be perfect.