Christoph Hoerl is Associate Professor (Reader) in Philosophy at the University of Warwick. Between 2004 and 2008, he was co-director (with Teresa McCormack and Johannes Roessler) of the interdisciplinary AHRC Research Project 'Causal Understanding: Empirical and Theoretical Foundations for a New Approach'. With Teresa McCormack and Stephen Butterfill, he is co-editor of Tool Use and Causal Understanding (OUP, forthcoming). Teresa McCormack is Professor of Developmental Psychology at the School of Psychology, Queen's University Belfast. She was co-director of the AHRC-funded project on Causal Understanding based at the University of Warwick. Her research primarily addresses issues concerning children's temporal and causal cognition. She has published two co-edited interdisciplinary books: Time and Memory: Perspectives in Philosophy and Psychology (OUP, 2001), with C. Hoerl, and Joint Attention and Communication (OUP, 2005), with N. Eilan, C. Hoerl, and J. Roessler. A further volume entitled Tool Use and Causal Cognition, co-edited with C. Hoerl and S. Butterfill is forthcoming with OUP. Sarah Beck studied Psychology and Philosophy at the University of Oxford and gained her PhD in developmental psychology from the University of Birmingham, where she is currently a Senior Lecturer. Her research is concerned with children's and adults' thinking about time and knowledge, with particular interest in the cognitive processes involved in the development of counterfactual thinking.