This is a very important question since it will provide a bit of background about you and the things that drive you to be successful in your career. Perhaps you became a case manager because of a personal experience. If so, provide some history. “My grandmother was very ill with cancer and I feel that she would have been able to make better decisions if she had been informed of all of her options” would be a fantastic answer. Otherwise, simply provide a brief explanation of why you chose this career. “I want to make sure that people who are ill or facing a crisis will have all of the information and support they need to make it through the difficult times.”