This paper proposes a project typology focused on system of systems (SoS) projects, which are recognised as complex in a hierarchy of simple, complicated, and complex. Three types of complex systems are proposed: traditional SoS projects, such as defence or air transport, in which a developing project incorporates an existing independent asset; SoS projects which address wicked problems and hence require use of soft system methods to determine stakeholders, boundaries and a solution process; and, integration of assets, such as states or enterprises into an encompassing system. Context, leadership style and personality types suitable for each are proposed. Some tools are referenced. Soft system methods to explore solutions to wicked problems are outlined.Vernon Ireland, Alex Gorod, Brian E. White, S. Jimmy Gandhi, Brian Sause
