The present paper identifies appropriate communication strategies to support the implementation of Cross Selling (CS) in the sales organization illustrated on the example of Robert Bosch GmbH. Therefore the focus is on the analysis of internally applied communication media in order to determine strong and weak points. In the first instance, an extensive literature research with respect to CS is conducted and a theoretical framework of effective communication provided. Subsequently, an empirical study is being carried out. Surveys are sent worldwide to the CS Coordinators at Bosch in order to analyse currently applied communication media and identify possible communication gaps. Furthermore, an expert interview with CS project leader Paulo Ferreira is conducted in order to gain additional insights into the CS field within Bosch. In the process, it results that the CS project team already makes an adequate use of communication means; but nevertheless there is still potential for improvement with respect to certain communication activities. The results indicate that the most effective communication techniques are based on face-to-face interaction with a high degree of social presence and information richness. By the application of theoretical foundations combined with knowledge obtained through primary research, a recommended course of action is issued on how to further optimize the communication within the central CS project team. On this basis, the recommendation is given to develop an internal integrated marketing communication program which takes a number of additional measures into consideration. In addition, limitations of this study as well as future perspectives are being discussed.