This paper presents and discusses the usage of the diary method in two case studies of group members’ information behavior and reflects upon the results and implications for future work. The diary focused on group members’ activities and emotional experiences during a project assignment, but differed in both design and usage between the two case studies, e.g. between a structured diary with fixed response-categories and an unstructured diary with no response-categories; between an electronic and a manually kept diary; and between four weeks and one week at three selected points. The diary method was found to generate useful data on group members’ actions and behavior,