Archaeologists have demonstrated that it is challenging but feasible to identify the material remains of apprenticing activities associated with stone tool and ceramic assemblages. Building on this work, I explore apprenticing behavior in North America's most intensive ancient shellworking context, using the large beadmaking assemblages from California's Channel Islands. I examine a spectrum of production errors associated with a newly identified variant of Olivella shell bead and offer generalizations about what we should find in the material record of apprentices engaged in manufacturing ornamental goods. I also explore how we may distinguish novices' errors from the mistakes of skilled experts experimenting with new bead forms. Existing ethnoarchaeological studies of children's roles and contemporary craft practitioners specializing in ceramics, bead making, stone work, and other materials are foundational sources of data for this project, providing insights into the transmission of technical information from experts to novices in communities of practice. Such work directly informs archaeological research and facilitates our understanding of apprenticing from periods and regions where ethnographic information is insufficient or inapplicable.By the time they achieved competence, every flintknapper who ever lived had probably already littered the landscape with thousands of virtually indestructible stone artifacts (Shea 2006:212).Growing interest in recovering the material remains of apprenticing activities has led archaeologists to systematically observe both the teaching environments associated with contemporary craft practitioners and the material products-