Assaf Nativ is an independent scholar. His primary interests pertain to how archaeologists construct their professional knowledge, especially pertaining to the value systems that underlie their choices and judgements. His practical experience was primarily acquired in the southern Levant, where he excavated sites spanning the Pottery Neolithic period and the twentieth century. Gavin Lucas is Professor of Archaeology at the University of Iceland. He has an enduring interest in the way archaeologists think and work, with a special interest in the concept of time. His main focus of fieldwork and empirical research has been on the archaeology of the last 500 years.