Estimates of the precise costs of school vandalism vary widely, but the seriousness of the problem is beyond dispute. It is possible to get a general idea of the nature and motivation of most vandals and, in doing so, begin to understand the problem and devise solutions for it. There are two basic approaches to vandalism prevention. Currently, as the literature indicates, most programs try to deter vandalism by taking defensive measures that make schools less vulnerable to the ravages of destructive intruders. Deterrent programs treat vandalism symptomatically, usually by emphasizing improved school security. The alternative approach is to treat vandalism diagnostically, attempting to prevent it by attacking its causes. The key to such a program is to involve people in the life of the school to combat the sense of alienation and indifference that seems to be the cause of most vandalism, and to utilize design solutions to reduce the costs of property damage caused by nonmalicious vandalism. (Author/MLF)