AFTER MODERATING AN INTERNET news group on computer accidents for 10 years, Peter Neumann knows that the danger is not hypothetical. A principal scientist at the think tank SRI in Menlo Park, Calif., Neumann shares his concerns in his new book, Computer-Related Risks (see review). "I wrote this book because I really believe that everyone needs to know the full extent of what can go wrong," he says. Neumann, who got his first computer job in 1953, began collecting stories of computer fiascoes in 1980. He started the Risks Forum, which is now one of the most popular special-interest groups on the Internet, with more than 100,000 readers per issue in 1985. "Almost all of us are dependent on computer technology in one way or another," Neumann says. "The risks are enormous....We do not learn very much from our disasters."