This chapter describes the process of building a collection, using the example of other-initiated repairs resolved by repetition. The phenomenon under investigation is shown in the following example: 1. A: you in the bathroom?2. B: huh?3. A: you in the bathroom? The focus of the chapter is more on the way in which the collection evolved and less on the analytic process. Lessons learned from building a collection as well as the strengths of this particular collection are discussed. The chapter also discusses the importance of linking linguistic phenomena, e.g. repetition, to social practices, e.g. other-initiated repair. It argues that tightly constrained collections can allow a clear demonstration of connections between linguistic forms and interactional practices. The chapter stresses how building a collection and conducting an analysis of it can be messy. The methodical process of setting a question, collecting just the right data to answer it, and discovering the answer, is the story we usually tell in our publications. This chapter instead tries to illuminate and illustrate just how rocky the path to completion can be.