Proceedings of 6th International Conference in Software Engineering for Defence Applications : SEDA 2018 This book presents high quality original contributions on new software engineering models approaches methods and tools and their evaluation in the context of defence and security applications. In addition important business and economic aspects are discussed with a particular focus on cost benefit analysis new business models organizational evolution and business intelligence systems. The contents are based on presentations delivered at SEDA 2018 the 6th International Conference in Software Engineering for Defence Applications which was held in Rome Italy in June 2018. This conference series represents a targeted response to the growing need for research that reports and debates the practical implications of software engineering within the defence environment and also for software performance evaluation in real settings through controlled experiments as well as case and field studies. The book will appeal to all with an interest in modeling managing and implementing defence related software development products and processes in a structured and supportable way