Photo: Apervita Progress has been made in healthcare with improving data interoperability, or "data liquidity," the ability of data to securely flow from one place to another, as needed and appropriate, for patient care and patient use. But there still is more work to do to get to a fully interoperable system. To get an in-depth look at interoperability and the healthcare knowledge that can stem from it, Healthcare IT News interviewed Dr. Blackford Middleton, chief informatics and innovation officer at Apervita, a health IT vendor of quality measurement, value optimization, clinical intelligence and interoperability solutions. Middleton also is a member of the advisory council to the standards body HL7.