This study describes how Minimum Data Set (MDS) coordinators' relationship patterns influence nursing home care processes. MDS coordinators interact with nursing home staff to coordinate resident assessment and care planning, but little is known about how they enact this role or influence particular care processes beyond paper compliance. Guided by complexity science and using two nursing home case studies, the authors describe MDS coordinators' relationship patterns by assessing the extent to which they used and fostered good connections, new information flow, and cognitive diversity. MDS coordinators at one site fostered new information flow, good connections, and cognitive diversity, which positively influenced assessment and care planning, whereas those at the other site did little to foster these three relationship parameters, with little influence on care processes. This study revealed that MDS coordinators are an important new source of capacity for the nursing home industry to improve quality of care.