The AAAI Conference on Artificial Intelligence has promoted theoretical and applied AI research as well as intellectual interchange among researchers and practitioners. As can be seen in these proceedings, AI's scope and influence continue to grow. The technical papers presented at the twenty-seventh meeting of this conference feature substantial, original research and practices. Volume five of the proceedings features papers grouped into the following categories: planning and scheduling, reasoning under uncertainty, robotics, search and constraint satisfaction, and vision, along with the Innovative Applications of Artificial Intelligence Conference (IAAI), which emphasizes the relevance of AI in our everyday lives.