This report is the result of a systematic review undertaken by the Australian Centre for Asthma Monitoring (ACAM) to refine and simplify asthma monitoring in Australia. A Delphi survey and correlation analysis were used to review the currently recommended list of 24 national asthma indicators in order to identify a smaller set of core indicators, which provide the most important and relevant information and which are more effective at signalling change for future asthma monitoring activities.