The measurement of the success of internal communication processes in meetings, where many managers spend a significant portion of their available time, is a task for controlling. Although communication training is regularly conducted to optimize these processes, there is usually a lack of systematic success monitoring of such communication-enhancing measures. In the context of performance measurement, Alexandra Rausch designs an indicator model based on the extended three-level concept, which serves as a measurement tool to identify success-relevant factors in meetings as well as their effectiveness and efficiency. Through the successive modification and optimization of the model during an empirical longitudinal study, the author demonstrates the relevant success factors and highlights the importance of the measurement instrument.