Whizbang computer systems are taken almost on faith as the solution to all sorts of ills in health care. In Washington, just about everyone supports the notion of beefed-up health information technology, at least in the abstract. The pitch has been that innovations like electronic health records and e-prescribing will improve patient care and safety while also saving money through increased efficiency. How much will be saved? Could be around $77 billion a year in all, according to a widely ci