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This paper presents an interactive module for learning both the fundamental and practical issues of servo systems. This module, developed using Simulink in conjunction with the Matlab graphical user interface (Matlab-GUI) tool, is used to supplement conventional lectures in control engineering and robotics subjects. First, the paper introduces the theoretical background of servo systems. Then, the interactive module is presented, with a description of its main features as well some hints on how to integrate Simulink models within Matlab-GUI. Some of the module's capabilities are illustrated through classroom examples. Finally, the experience of putting this into use and student assessment of the tool are also addressed.