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This workshop gathered leading researchers in information retrieval, human-computer interaction and information behavior to discuss challenges and opportunities associated with the development of systems and tools to support people involved with complex, multi-search and multi-session search tasks. Such task-based search systems present many challenges and the goal of this workshop was to enumerate, discuss, and document these challenges into a research agenda to guide future research. This article includes a description of the motivations and goals of the workshop and syntheses of major workshop activities including pre- workshop identification of challenges by each participant and discussion breakout groups. Major themes of the workshop included the development of domain-neutral modeling techniques to represent tasks, task properties and task-related search behaviors, interface support tools to assist with a variety of task-related information behaviors and the identification of techniques and tools to evaluate task-based search systems. The most critical need identified was the development of task models; this was viewed as essential for addressing the challenges of tools and evaluation measures.