The process of apprenticeship is one means of entering a new profession. Along with the technical skills entailed in learning a new job, apprentices need to acquire proficiency in appropriate ways of communicating in order to construct a convincing professional identity. Data collected on a New Zealand building site provides evidence of the extent of the situated learning in which building apprentices engage. Becoming an accepted member of the community of practice centrally involves learning to recognize and respond appropriately to (...) a wide range of differently encoded directives, for instance. But membership also entails developing an understanding of more subtle interactional norms, such as acceptable topics of small talk and appropriate forms and quantities of humour on the job. This article examines evidence that suggests these understandings develop gradually as apprentices move from peripheral to core status in their chosen professional community of practice. We also explore the implications of the analysis for a more nuanced understanding of the complexities of the community of practice framework. (shrink)