This case illustrates how a mixed-methods approach facilitates the study of social interactions at the individual level. Using the case of the diffusion of a new crop in rural villages, it describes the collection and analyses of the data reflecting farmers’ adoption behavior and the data representing the social networks in which adoption takes place. It is often challenging to obtain a workable complete dataset of micro-level behavioral data and social network data. This case shows how to collect these data in an approach with pragmatic strategies that use primary and secondary research jointly. Specifically, it illustrates the collection of the data of various ascribed social relationships using interviews and pre-existing documents and the data of adoption behavior using questionnaire and historical records.