Issued in October 2008. Airport Collaborative Decision Making (CDM) is an important enabler of Air Traffic Management (ATM) capacity and efficiency. The concept of Airport CDM does not imply any particular system or architecture. Rather, it is an approach to using aeronautical data, based on sharing data between all Partners, ensuring a common view of the ATM and airport environment on all levels. Airport CDM also addresses the need for operational decisions to be made collaboratively thus providing a substantial contribution to maximising capacity and efficiency. Although Airport CDM is applicable to all phases of flight, the Airport CDM concept has seen its first prototypes and trials at airports and this document is therefore dedicated to Airport CDM. An Airport CDM Task Force was created under the EATM Airport Throughput Business Division (APT) of EUROCONTROL, and documents created by this Task Force have contributed significantly to the development of this document. Airport Collaborative Decision Making is about improving the way operational Partners at airports and the European ATM network work together at an operational level.