The book "Human-Computer Systems Interaction" offers a comprehensive analysis of the challenges and developments in the field of Human-Computer Interaction (H-CSI). In recent decades, technology has advanced rapidly, leading to an increasing significance of H-CSI issues. User expectations for computers and their performance have risen, highlighting the need for effective interaction between humans and machines. This specialized book gathers selected contributions that illuminate various aspects of H-CSI and is divided into five parts: general H-CSI problems, applications to support people with disabilities and medical H-CSI applications, psychological and linguistic aspects of H-CSI, robotic and training systems, as well as various H-CSI applications. The diversity of topics and the depth of analysis make this book a valuable resource for researchers and professionals engaged with the interface between humans and computers.