David Taylor from Derbyshire has been a Head of Science for 14 years and has worked as an examiner and moderator for both AQA and OCR for 15 years. David has delivered INSET at various teachers' conferences, and has contributed to a wide range of research publications and assessment material. Tim Greenway is an experienced subject leader and Head of Department, he worked for North Yorkshire LEA as a Science Consultant and advisor for 3 years before leaving to take on a senior leadership position within a 14-19 College. He has worked for OCR for ten years as an examiner, moderator, team leader and area moderator. In addition, acting as a Physics Education Policy Advisor for the Institute of Physics, he acts as a scientific consultant to Rolls Royce and the Pennine Water Group. Ray Oliver teaches in Hertfordshire and has wide experience as both HOD and subject leader in a variety of schools. He is the author of more than 20 science textbooks for KS3 and KS4. He has contributed educational material regularly to several newspapers including the TES. He works with industrial companies as an education consultant and as the author of resources to support secondary science teaching. Ray also has experience as a publisher developing new school science resources. Ed Walsh is Science Adviser in Cornwall and the Series Editor for Collins KS3 Science. He has contributed to Collins KS4 Science books supporting courses from AQA, EdExcel and OCR, and has written materials for the Secondary National Strategy. Ed was a teacher for 20 years, 12 as subject leader, and has taught in Manchester, South Wales and Cornwall. He is a regular provider of CPD events at ASE Conferences.