This paper presents an initial report on modelling patterns and architectures for system of systems (SoSs) and their constituent systems (CSs). Fundamental architectural principles for systems and SoSs and relevant work published so far are discussed and summarised. We introduce an initial set of five architectural patterns suitable for SoS design, illustrating each pattern with an SoS example and identifying how it meet some basic SoS aims. Finally, we summarise our plans for developing these ideas in the future.