The work "Human-Computer Interaction: Users and Contexts" is a comprehensive collection of research papers presented at the 17th International Conference on Human-Computer Interaction (HCII 2015). This three-volume series includes carefully selected contributions from 1,462 authors and 246 posters, chosen from a total of 4,843 submitted works. The conference took place in August 2015 in Los Angeles and highlights the latest developments and research in the field of human-computer interaction. The topics covered range from the design and use of computer systems to the human aspects involved in interacting with technology. The contributions are divided into thematic sections that address the quality of interactions on the web and social media, the application of HCI in business and industry, as well as the societal and cultural impacts of technology.