**Yvonne Rogers **is the Director of the Interaction Centre at University College London as well as a Professor of Interaction Design.Helen Sharpis Professor of Software Engineering at the Open University, UK.Jennifer Preece is Professor and Dean Emerita in the College of Information, Maryland's iSc...

**Yvonne Rogers **is the Director of the Interaction Centre at University College London as well as a Professor of Interaction Design.Helen Sharpis Professor of Software Engineering at the Open University, UK.Jennifer Preece is Professor and Dean Emerita in the College of Information, Maryland's iSchool - at the University of Maryland.