The Maternity Care Classification System, or MaCCS, was developed as part of the National Maternity Data Development Project to provide a comprehensive classification system for maternity models of care operating in Australia. This report describes a pilot test that was conducted as part of the data development work on an important element of the MaCCS: the Maternity Model of Care Data Set Specification. Included in the report is a background description of the work, methodology, logistics and the results of the pilot.