Solution based therapy: applications to everyday life

I read, during my period of tennis elbow, a chapter in Clinton and Ohlschlager's book, Competent Christian Counseling, on brief solution-based therapy. While I will write more about this later, I found it quite instructive because it's philosophy is one I never thought of before. The idea behind solution based therapy is that no one does the undesirable behavior 100% of the time. For instance, someone who is often depressed still has times when they are not depressed. The key to this method is figuring out why they are not depressed when they are not depressed. Perhaps they have stopped ruminating for a short time. Perhaps it was because they exercised. So, the key to this method is to expand the desired behavior until it becomes the dominate behavior. Doesn't this sound like it could all of us?