In the context of vocational and academic training, MR makes it possible to implement digital interactive elements that cannot be represented in reality, while giving the user the possibility of perceiving the external environment. This is not possible with VR. This tracking technology in MR enables the helmet to create a sense of presence and immersion during use, allowing users to interact with virtual objects as if they were real . Training and assistance are applications compatible with MR, as they can considerably facilitate, support and optimize production, assembly and maintenance tasks in real time in industrial environments and in particular Industry 4.0 - . MR increased training efficiency by improving knowledge acquisition and retention . This technology is notably used for training in invasive surgical procedures .