Recently, more sophisticated assistive devices than ever have been developed. For example, cooperative robots that can work beside human workers without safety fence start being introduced in production lines. A powered exoskeleton provides mobility assistance for infirm people. There are Mechatronics-based technical fields which are expected to meet a great demand in our society in the next decade. Human-support technologies and medical/rehabilitation robotics are strong candidates. In such applications, we must consider the human-in-the-loop control system in terms of stability and robustness. It will bring new technical issues in Mechatronics systems. This session provides an opportunity to discuss sensing, actuation, and control for human-in-the-loop systems.