In general, the methods for measuring human emotion are divided in two categories, one is the psychological way based on user's subjective evaluation and the other is the physiological way based on physiological signals. However, these methods have some well known limitations. In this research we suggested the methods for measuring user's emotion in the natural and accessible environment for the design field. In order to observe user's emotional changes while they interact with a product, the

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... deo-debriefing and emotion logging program "VideoTAME" was developed as an effective measurement tool for complementing the current psychological methods. In the Testing Module of VideoTAME, subjects engaged in 'Video-Debriefing' after usability testing: They evaluate their emotional changes through playing and watching the video clips of their performing tasks in the experiment room. In the Analyzing Module, the researchers replay the results created by subjects during the experiment and analyze the results using Microsoft Excel. It is hoped that this study will be of great help for designers for effective measurement of user's emotions naturally expressed while using a product.