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Model Archiving and Sustainment for Aerospace Design, written by Sean Barker, an industry veteran from the UK, focuses on the techniques developed by the LOTAR (Long Term Archiving and Retrieval) project, a collaboration among the major US and European aerospace companies. Long-term archiving models follows LOTAR by taking the exchange of mechanical CAD fi le as the paradigm for long-term retention and developing general principles for model archiving. These include electrical systems, composite parts, systems engineering and requirementsengineering. The increasing availability of model-based software has made the problems of long-term model sustainment more visible and pressing for a solution. Industries following LOTAR today include aerospace, automotive, nuclear and ship building. In the aerospace sector, the challenges are even bigger.

Aircraft as a System of Systems: A Business Process Perspective, written by Sean Barker, FBCS CEng and a former research scientist at BAE Systems in the UK, explains how developing even simple parts like a lever needs several different types of knowledge before moving on to the complications of designing a system. Today's airframers have taken on more of the role of systems integrators, putting the focus on the aircraft as a system-of-many-systems. Whereas an aircraft integrates many different systems into a single design, the system of systems which supports it is built by federating the systems of the different organizations, which were built and run independently of each other. Aircraft as a System of Systems: A Business Process Perspective provides a thorough analysis of how building aircraft taps into a huge pool of knowledge, how its complexity is also reflected in the numerous process links that exchange knowledge between different groups.