Welcome to Volume 4, Issue 1 of Human-Computer Interaction Perspectives (HCIP), where we continue our exploration of the ever-evolving landscape of human-computer interaction (HCI). In this edition, we present two pioneering papers that illuminate essential aspects of HCI research. "Cognitive Modeling in HCI" delves into cognitive modeling theories and applications, providing insights into human information processing and decision-making within interactive systems. Simultaneously, "Augmented Reality User Interfaces" investigates design principles and evaluation methods for augmented reality (AR) user interfaces, aiming to enhance user interaction and experience in immersive environments. Join us as we delve into the complexities of HCI, shaping the future of interactive technology and human-centered design.