This chapter reviews the current state of research on sensor-integrating machine elements (SiME) and their application in industry. SiME are mechanical elements that integrate sensory functions, enabling digitalization in mechanical engineering. The focus is on the methodological aspects of developing these elements, including robust design, modularization, and the integration of smart materials and add-on sensors. The authors, who are part of a special research program funded by the German Research Foundation (DFG), aim to facilitate knowledge exchange by providing a comprehensive overview. The chapter discusses challenges such as energy supply, data transfer, and data security in rotating systems. It also covers the classification of SiME based on sensor output and functional structure, the importance of continuous research in machine elements, and the sub-functions of SiME. Additionally, it explores sensor materials, sensory effects, and add-on sensors, emphasizing the need for methodological support in developing SiME. The chapter concludes with a discussion of engineering approaches for SiME, including robustness in measurement procedures and modularization of microelectronic sensor systems.This chapter reviews the current state of research on sensor-integrating machine elements (SiME) and their application in industry. SiME are mechanical elements that integrate sensory functions, enabling digitalization in mechanical engineering. The focus is on the methodological aspects of developing these elements, including robust design, modularization, and the integration of smart materials and add-on sensors. The authors, who are part of a special research program funded by the German Research Foundation (DFG), aim to facilitate knowledge exchange by providing a comprehensive overview. The chapter discusses challenges such as energy supply, data transfer, and data security in rotating systems. It also covers the classification of SiME based on sensor output and functional structure, the importance of continuous research in machine elements, and the sub-functions of SiME. Additionally, it explores sensor materials, sensory effects, and add-on sensors, emphasizing the need for methodological support in developing SiME. The chapter concludes with a discussion of engineering approaches for SiME, including robustness in measurement procedures and modularization of microelectronic sensor systems.