Given that human beings are not perfect, errors are an inevitable. If the consequences of our errors were always minor, limited, and easily remedied, it would be an error to call "error" a problem. However, the social and technological systems which man is developing are becoming more complex, thus increasing the risk that human error, miscalculation or misinterpretation of data will lead to accidents, disasters or social crises. The belief that reassigning tasks to computers is a solution is, in fact, part of the problem: ultimately, every machine depends on the competence of its human makers and operators. High technology does not decrease the possibility of human error, it increases it. Power is concentrated to the extent that a single fault can be disastrous.