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The paper presents an ongoing development of an analytical tool for the clickstreams of video lectures. This work was motivated by the increasing number of video tutorials in graphical software applications. Although the clickstreams have been used to examine students’ detailed behaviors, few analytical tools have been designed from the instructors’ viewpoint. The tool we have developed includes four major interfaces: (1) accumulated behavior, (2) individual time history, (3) video control, and (4) a note-taking area. We also designed a global time controller, which users may move in all of the interfaces except the note-taking area, thus synchronizing the time stamps among the other interfaces. An actual CAD video lecture clickstream of 53 students and 103,679 clicks was used to validate the tool. We found that the analytical tool can help identify students' behaviors.