This book constitutes the refereed proceedings of the 8th International Conference on Engineering Psychology and Cognitive Ergonomics, EPCE 2009, held in San Diego, CA, USA, in July 2009, within the framework of the 13th International Conference on Human-Computer Interaction, HCII 2009, together with 10 other thematically similar conferences. The 66 revised papers presented were carefully reviewed and selected from numerous submissions. The book has been split into the following four topical sections: cognitive approaches in HCI design, interaction and cognition, driving safety and support, and aviation and transport.