The four year Complex Modelling research project investigates the infrastructures of our design models. By questioning the tools for integrating information across the expanded digital design chain, the project asks how to support feedback between different scales of design engagement moving from material design, across design, simulation and analysis to specification and fabrication.The project focuses on the integration of material performance as a particular challenge opening up new horizons for a sustainable building culture. The ability to design for and with material performance is a core resource for design innovation closely tied to material optimisation. The project introduces three scales of design engagement by which to examine material performance: the structure, the element and the material. Positioning feedback as a central concern cascading through all scales of engagement, the project asks how dynamic modes of organisation including self-organisation, multi-scalar modelling and self-adaptive m