The elite team of engineers and medical specialists assembled by IBM's Watson Health division had the innocuous code name "Project Josephine," but its mission could not have been more urgent: to fix the artificial intelligence software at the core of the company's campaign to tackle the $7 trillion global health care market. The predicament faced by IBM officials, STAT has found, was that it could not get its software to reliably understand and analyze language in patient medical records. That was critical for the company to deliver on multimillion-dollar contracts with hospitals and drug companies. Unlock this article by subscribing to STAT Plus and enjoy your first 30 days free! STAT Plus is a premium subscription that delivers daily market-moving biopharma coverage and in-depth science reporting from a team with decades of industry experience.