This article focuses on the role of the Association for Science Education (ASE) in supporting and developing policy and practice in primary school science. It first sets the events after the formation of ASE in 1963 in the context of what went before. It then takes a mainly chronological view of some, but by no means all, of ASE's activities that have had an impact on primary science in the past 50 years. More details can be found in Chapter 4 of Advancing Science Education: the First Fifty Years of the Association for Science Education (Jenkins and Wood-Robinson, 2013).