The Interoperability for Situation Management and Decision Making (SMADM) is an annual workshop of the IEEE Conference on Cognitive and Computational Aspects of Situation Management (CogSIMA). The CogSIMA conferences have produced a wealth of research results and applications. While these research and development projects have been valuable, the risk is that they will be unconnected “silos”, a common problem throughout academics and industry. The purpose of this annual workshop is to examine issues such as harmonization, integration and interoperability of situation management and decision making, and to propose possible solutions. So far there have been three installments of SMADM: