1. Advances in Usability, User Experience, Wearable and Assistive Technology : Proceedings of the AHFE 2021 Virtual Conferences on Usability and User Experience, Human Factors and Wearable Technologies, Human Factors in Virtual Environments and Game Design,

2. Advances in Human Factors in Architecture, Sustainable Urban Planning and Infrastructure : Proceedings of the AHFE 2021 Virtual Conference on Human Factors in Architecture, Sustainable Urban Planning and Infrastructure, July 25-29, 2021, USA