Web browsers and search engines are usually designed to support one user, working alone. However, collaboration on information-seeking tasks is actually normal. Students work together to complete homework assignments, friends seek information about entertainment opportunities together, family members jointly plan vacation travel, and his colleagues jointly conduct research for their projects. As an upgraded network technology and the emergence of social media to simplify the process of remote collaboration, and large, the novel displays the form-factor simplifies the process of co-located group work, researchers have begun to explore ways to facilitate collaboration on search tasks. This course examines the who, what, where, when and why collaborative search, and provide insights on how the solutions that emerge to address the needs of collaborators'.