This issue unusually has two 'themes' - the first celebrating 100 years of SSR, with the Editor marking this historic occasion with an account of SSR's evolution over the century. The second theme is entitled 'Framing the secondary science curriculum' and is guest edited by Anthony Tomei CBE, Director of The Salters' Institute. He writes: 'The aim of the professional bodies, working with the ASE and others, is to develop guidance for well-thought-out and coherent curricula that the science and science education communities can support with conviction and enthusiasm. The vision is to develop curricula that will endure because they are based on clear principles and an understanding of best practice, and because they carry the support of all the key stakeholders and above all of science teachers. Our hope is that this edition of School Science Review will mark the beginning of that process'.