This fourth volume in the series examines workshops and discusses the craftspeople in the Viking town of Kaupang including their activities, crafted products, raw materials, skills and networks. The study focuses on artefacts used in on-ferrous metalworking: crucibles, moulds, matrix dies, tuyeres and a unique collection of lead models. The tools and the waste material provide a completely new understanding of the craftspeople who were working with gold, silver, copper alloys, lead and tin. These metalworkers mastered many different materials and techniques; indeed, they were well-informed, well-trained and skilful, and manufactured a range of different items for women and men. There is every reason to believe that visitors and residents perceived the non-ferrous metalworking as a defining feature of the Viking-period town. The combination of excavations and surface surveys has produced a broad and diverse collection of material very similar to finds in different Viking-period towns