Simon Broadley has been teaching secondary science for 18 years, specialising in biology and applied science, and with responsibility for leading Biology and BTEC courses. Simon has a PhD and BSc in microbiology. Simon has been an OUP author for seven years, writing student and teacher resources for KS3 and GCSE. Mark Matthews has been teaching secondary science for over 20 years, specialising in Biology and AppliedScience, and with responsibility for leading biology and BTEC courses. Mark has a PhD in Developmental Biology and a BSc in Zoology. An experienced author, Mark has been writing for OUP for seven years, with published student and teacher materials for KS3 and GCSE. Victoria Stutt has been teaching since 2004, working across key stages and with experience of coordinating KS3. She is an experienced GCSE and A-Level author, and has written successful assessment titles for KS3. Victoria has an honours degree in Chemistry and a PGCE from the University of Sussex. Dr Andrew Chandler-Grevatt