Helen Reynolds is an Institute of Physics Teaching and Learning Coach, and a former Head of Science. She is an experienced secondary science teacher, and has a MA in Physics and a PGCE from the University of Oxford. Helens authoring experience includes recent student and teacher materials for Cambridge Secondary 1. Dr Andrew Chandler-Grevatt has a PhD in school assessment, and a real passion forscience teaching and learning. Having worked as a science teacher for ten years, of which five were spent as an AST, Andy has a real understanding of the pressures and joys of teaching in the classroom. Alongside his national and international research in school assessment, Andy is a teaching fellow on the PGCE course at the University of Sussex, and is a successful published assessment author.