Paul Warwick is a Lecturer in Primary Science at Homerton College, Cambridge. He previously taught in primary schools and was an Advisory Teacher for Science. His research interests are IT in science , children's understanding of the procedural aspects of science and the assessment of children's learning. Rachael Sparks Linfield is a reception teacher at St John's College School, Cambridge and was previously a Lecturer in Primary Science at Homerton College, Cambridge. She was written widely in the area of early years education and her research interests include assessment of early years science.