Various sports teams conduct team interventions throughout the season. In most cases, however, the effect of these interventions is only very small. Within this abstract, we argue in favor of a theory-based methodology when planning and conducting team diagnostics and interventions: (1) getting an overview of those group processes or team factors with theoretical and empirical relevance for team performance; (2) selecting valid instruments for a team diagnostics; (3) conducting the team diagnostic to detect factors that are in need of improvement; (4) based on the results of the diagnostics, selecting intervention methods that show empirical evidence regarding a specific effect on the respective factors, and that can easily be implemented into daily training; (5) conducting the intervention with a duration of several weeks; and (6) evaluating the effects of the intervention. The different steps of this methodology as well as perspectives and limitations are discussed. (übern.)
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