Our project team developed or refined and updated a total of 12 educational modules focusing on CDC's Category A agents and other emerging infectious diseases. We developed post-test instruments and case-based scenarios germane to the VA patient population for anthrax and smallpox. Materials were designed specifically for the unique clinician populations and electronic educational applications available in VAMCs. Website functionality and content were refined using the nominal group technique and "thinking aloud" protocols. We tested our innovative, web-based educational intervention at fifteen VA facilities via a randomized controlled trial (RCT).