A Wisconsin task force has completed its research on what barriers exist to creating secure, private interoperable health information exchanges--and it looks like getting even a single statewide health data network going won't be a picnic. Five particularly large obstacles, it found, included developing a common method for validating health information requests, finding ways to share information in a timely way, ensuring that information was complete, discovering ways to tie in out-of-state information from close-in metros and providing good training for data users. Report (.pdf)