The Social and hUman ceNtered XR (SUN) project aims at investigating and developing extended reality (XR) solutions that integrate the physical and the virtual world in a convincing way, from a human and social perspective. The virtual world will be a means to augment the physical world with new opportunities for social and human interaction. We will address the following limitations: ● Lack of solutions to develop scalable and cost-effective new XR applications; ● Lack of convincing solutions for mixing of the virtual and physical environment; ● Lack of plausible and convincing human interaction interfaces in XR; ● Barriers due to resource limitations of end-user devices; We will develop solutions to surpass current limitations, including: ● Development of scalable solutions to obtain plausible and convincing virtual copies of physical objects and environments; ● Development of solutions for a seamless and convincing interaction between the physical and the virtual world; ● Development of wearable sensors and haptic interfaces for convincing and natural interaction with the virtual environment; ● Development of artificial intelligence-based solutions to address current computing, memory, and network limitations of wearable devices; The developed solution will be demonstrated in three real-life scenarios: 1 XR for rehabilitation after accidents or diseases. 2 XR in the industry to increase safety and improve social interaction among workers. 3 XR to remove interaction barriers for persons with disabilities.