At the heart of protein¿s aggregation are specific molecular events; and how they are modulated by changes in solvent conditions is key to our understanding and control of fibrillogenesis. A certain class of structural fibrous proteins may provide the answer. Indeed, spider silk and silkworm silk proteins have evolved to readily form ¿insoluble¿ ordered structures. But, to date little is known about the series of association steps involved in the nucleation and growth of silk protofilaments. To characterise this process we must clearly establish the kinetics of silk fibril assembly and elongation. Therefore, we wish to follow the early events of fibrillogenesis by SANS and SAXS/WAXS to investigate the morphology, structures and hydration state of silk proteins intermediates.