Ethnomethodology (EM) has been fundamental to Routine Dynamics theorizing since its inception. However, whereas EM is well known for its detailed studies of face-to-face interactions, its relevance to understanding phenomena such as routines that span multiple spaces and times is less widely recognized. EM studies of routine dynamics take a primary interest in the taken-for-granted yet systematic ways in which members produce actions that are accountably “the same” across sites and occasions. Through sequenced embodied displays of orientation to material elements of the setting and the unfolding interaction, members construct in situ an interaction that is meaningful to them. To the extent that some such elements are available and oriented-to by actors across multiple sites and occasions, a pattern of repetitive action becomes observable. EM thus provides the theoretical underpinning for an understanding of routines as situated actions, and paves the way for a program of routine dynamics research grounded in the empirically observable material and embodied processes of interaction that constitute repetitive action patterns.