Longitudinal communication data are needed to understand the dynamics, adaptation, and evolution of networks over time, particularly when the mode of interaction is face-to-face communication. Traditional means of collecting communication and interaction data that include questionnaires are often not appropriate for collecting this type of dynamic information. To push the field beyond the analysis of discrete snapshots of interactions and speculation about what occurs between those snapshots, an observational data-collection tool called Work Observer was designed by the Army Research Laboratory and is freely available to the research community.
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