This volume is the fourth and final volume resulting from a focused programme of research and intensive group discussion of a wide range of topics related to the archaeological (and to a lesser extent, historical and anthropological/ethnographic) analysis of ancient societies in and around the Sahara, from the first millennium BC to the mid-second millennium AD. While the focus of the present volume is technology, there will inevitably be discussion of cross-overs and contrasts with the main conclusions from earlier volumes in the series. As explained in the Preface above, the Trans-SAHARA project evolved out of a long-term programme of fieldwork on an ancient people of the Libyan Sahara. Just as they occupied a significant nodal location in the Sahara, the Garamantes are at the centre of this volume, but the scope of debate here extends way beyond the history of a single group. Connections and barriers within the Trans-Saharan region (and the interrelationship between these two aspects) form one focus. In this introduction we present an overview of crucial themes and considerations which cross-cut all or many of the contributions. Includes bibliographical references and index.