This four-volume set LNCS 5610-5613 constitutes the refereed proceedings of the 13th International Conference on Human-Computer Interaction, HCII 2009, held in San Diego, CA, USA in July 2009, jointly with 8 other thematically similar conferences. The revised papers presented were carefully reviewed and selected from numerous submissions. The papers accepted for presentation thoroughly cover the entire field of Human-Computer Interaction, addressing major advances in knowledge and effective use of computers in a variety of application areas. The papers of this first volume are organized in topical sections on novel techniques for measuring and monitoring, evaluation methods, techniques and tools, user studies, user interface design, development approaches, methods and tools.