Philip David Zelazo (Ph.D. 1993, Yale University) is Associate Professor of Psychology and Psychiatry at the University of Toronto, where he holds a Canada Research Chair in Developmental Neuroscience. His research concerns dorsolateral prefrontal and orbitofrontal contributions to the typical and atypical development of executive function. He is Editor of the Journal of Cognition and Development, and Series Editor of the Developing Mind Series. Ulrich Müller (Ph.d. 1998, Temple University) has been Assistant Professor Psychology at Pennsylvania State University, and is now at the University of Victoria, in British Columbia, Canada. His research centers on the early development of reasoning, executive function, and social understanding. He serves on the Editorial Boards of Child Development and the Journal of Cognition and Development and has been a member of the Board of Directors of the Jean Piaget Society. Douglas Frye (Ph.D. 1978, Yale University) is Chair of the Psychology in Education Division, Graduate School of Education, University of Pennsylvania. His research focuses on children's theory of mind, executive function, and strategies in mathematical understanding. He is currently Associate Editor of the journal Child Development and serves on the Editorial Board of the Journal of Cognition and Development. Stuart Marcovitch (Ph.D. 2001, University of Toronto) is currently a postdoctoral fellow in the Department of Infant Development, New York State Institute for Basic Research, Staten Island, New York. His research focuses on cognitive development in infants and preschoolers.

• Abstract. 1. The Development of Executive Function.2. Study 1: Memory and Executive Function.3. Study 2: Rule Complexity and Stimulus Characteristics in Executive Function.4. Study 3: What Do Children Perseverate on When They Perseverate.5. Study 4: Negative Priming and Executive Function.6. The Development of Executive Function: Cognitive Complexity and Control-Revised.7. Appendix: Summary of Versions of the Dimensional Change Card Sort Used.II. Commentary.8. Executive Function in Context: Development, Measurement, Theory, and Experience: Stephanie M. Carlson (University of Washington).Contributors.Statement of Editorial Policy

Philip David Zelazo (Ph.D. 1993, Yale University) is Associate Professor of Psychology and Psychiatry at the University of Toronto, where he holds a Canada Research Chair in Developmental Neuroscience. His research concerns dorsolateral prefrontal and orbitofrontal contributions to the typical and atypical development of executive function. He is Editor of the Journal of Cognition and Development, and Series Editor of the Developing Mind Series. Ulrich Müller (Ph.d. 1998, Temple University) has been Assistant Professor Psychology at Pennsylvania State University, and is now at the University of Victoria, in British Columbia, Canada. His research centers on the early development of reasoning, executive function, and social understanding. He serves on the Editorial Boards of Child Development and the Journal of Cognition and Development and has been a member of the Board of Directors of the Jean Piaget Society. Douglas Frye (Ph.D. 1978, Yale University) is Chair of the Psychology in Education Division, Graduate School of Education, University of Pennsylvania. His research focuses on children's theory of mind, executive function, and strategies in mathematical understanding. He is currently Associate Editor of the journal Child Development and serves on the Editorial Board of the Journal of Cognition and Development. Stuart Marcovitch (Ph.D. 2001, University of Toronto) is currently a postdoctoral fellow in the Department of Infant Development, New York State Institute for Basic Research, Staten Island, New York. His research focuses on cognitive development in infants and preschoolers.

• Abstract. 1. The Development of Executive Function.2. Study 1: Memory and Executive Function.3. Study 2: Rule Complexity and Stimulus Characteristics in Executive Function.4. Study 3: What Do Children Perseverate on When They Perseverate.5. Study 4: Negative Priming and Executive Function.6. The Development of Executive Function: Cognitive Complexity and Control-Revised.7. Appendix: Summary of Versions of the Dimensional Change Card Sort Used.II. Commentary.8. Executive Function in Context: Development, Measurement, Theory, and Experience: Stephanie M. Carlson (University of Washington).Contributors.Statement of Editorial Policy

Philip David Zelazo (Ph.D. 1993, Yale University) is Associate Professor of Psychology and Psychiatry at the University of Toronto, where he holds a Canada Research Chair in Developmental Neuroscience. His research concerns dorsolateral prefrontal and orbitofrontal contributions to the typical and atypical development of executive function. He is Editor of the Journal of Cognition and Development, and Series Editor of the Developing Mind Series. Ulrich Müller (Ph.d. 1998, Temple University) has been Assistant Professor Psychology at Pennsylvania State University, and is now at the University of Victoria, in British Columbia, Canada. His research centers on the early development of reasoning, executive function, and social understanding. He serves on the Editorial Boards of Child Development and the Journal of Cognition and Development and has been a member of the Board of Directors of the Jean Piaget Society. Douglas Frye (Ph.D. 1978, Yale University) is Chair of the Psychology in Education Division, Graduate School of Education, University of Pennsylvania. His research focuses on children's theory of mind, executive function, and strategies in mathematical understanding. He is currently Associate Editor of the journal Child Development and serves on the Editorial Board of the Journal of Cognition and Development. Stuart Marcovitch (Ph.D. 2001, University of Toronto) is currently a postdoctoral fellow in the Department of Infant Development, New York State Institute for Basic Research, Staten Island, New York. His research focuses on cognitive development in infants and preschoolers.

• Abstract. 1. The Development of Executive Function.2. Study 1: Memory and Executive Function.3. Study 2: Rule Complexity and Stimulus Characteristics in Executive Function.4. Study 3: What Do Children Perseverate on When They Perseverate.5. Study 4: Negative Priming and Executive Function.6. The Development of Executive Function: Cognitive Complexity and Control-Revised.7. Appendix: Summary of Versions of the Dimensional Change Card Sort Used.II. Commentary.8. Executive Function in Context: Development, Measurement, Theory, and Experience: Stephanie M. Carlson (University of Washington).Contributors.Statement of Editorial Policy