The aims and scope of the second edition are unchanged from the first edition. The major market is in health informatics education. The three part format, which covers principles of health interoperability, HL7 and interchange formats, and SNOMED CT and clinical terminology, works well. In the US, The ONC (Office of the National Coordinator for Health Information Technology) has estimated that the HITECH stimulus will create more than 50,000 new jobs for health informatics professionals, who need to be educated.