This class is case-oriented, problem-solving approach for learning practical issues of occupational and environmental health problems of workers who are potential victims of work-related diseases/injuries. It provides a unique opportunity for graduate students and residents of occupational medicine to integrate and apply practical skills and training for hazard identification through onsite walkthrough, discussion and writing reports. Under the supervision and guidance of senior occupational physicians, the trainee will develop technology of how to recognize occupational and environmental hazard as well as recommendation for prevention and management. .