THE 1984 CHEMICAL disaster in Bhopal, India, was first and foremost a terrible human tragedy. For those who were there and even for those at considerable distances who read about it, the reality of 2000 or more persons dead and many tens of thousands poisoned by a toxic cloud is horrifying. However, in its particulars and complexities, Bhopal's chemical disaster can also serve as a case example for almost any discipline taught in a school of public health.