Activities are inadequately operationalized in conversational analysis and interactional linguistics. This is partly due to the way in which we analyze phenomena in talk-in-interaction: analyses of interactional practices are comprised of collections of excerpted sequences of talk, and while these excerpts preserve their sequential contexts, they often lose analytical grasp of the longer, more extended courses of activity in which they are situated. As a consequence, these analyses can efface how people orient to more extended structures (like activity) as units of action that emerge within—and are constituted through—interaction. This study addresses this gap by analyzing participants collaborating in temporally-extended multi-component activities with a focus on methods they use to coordinate their current actions longitudinally as either being part of one continuous interaction, or several distinct, temporally-unfolding activities. We point to one set of methods—noticings—that people use in ways that routinely display the relevance of these actions to participants' current understanding of the activity in progress.