Ubiquitous computing will help in the organization and mediation of social interactions wherever and whenever these situations might occur. With those technologies, learning environment can be embedded in real daily life. Especially, RFID (Radio Frequency Identification) tags are very useful and important technology to realize ubiquitous computing, because they are able to bridge real objects and information in a virtual world. RFID tags will be embedded in a lot of physical objects in the near future in order to trace products shipping, and so forth. Also, this paper proposes a computer-assisted language learning (CALL) using RFID tags, which is called TANGO (Tag Added learNinG Objects).TANGO detects the objects around the learner using RFID tags, and asks the learner appropriate questions for vocabulary learning in daily life with PDA. There are two different kinds of users of this system: one of them is an overseas University Student in Japan, who wants to learn Japanese Language; the other is a Japanese Student who is interested in English as a second language and plays an important role as a helper for the overseas student. They can share their knowledge through RFID tags and learn language with authentic and tangible objects. In the experiment conducted, the learners were very interested in this system.
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