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The interface chosen for the system is the visit metaphor in order to leave the student free in exploring a virtual environment.ECHO was designed by the Advanced Methodologies and Interface Design group (MEDIA group), of the L.I.T (Laboratory of Information Technologies) of the AleniaThe paper, after a brief MEDIA group description, discusses the theory (as the theoretical framework and system architecture), as well as the user interface specific aspects (as the basic idea, the functionalities, and the interface structure). Finally the paper describes some implementation notes.<\/jats:p>","DOI":"10.1145\/231132.231152","type":"journal-article","created":{"date-parts":[[2007,1,17]],"date-time":"2007-01-17T18:32:02Z","timestamp":1169058722000},"page":"97-101","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Virtual ECHO"],"prefix":"10.1145","volume":"28","author":[{"given":"Daniela","family":"Meloni","sequence":"first","affiliation":[{"name":"MEDIA Group, Laboratorio di Tecnologie dell'Informazione, Rome, Italy"}]},{"given":"Alessandro","family":"Mura","sequence":"additional","affiliation":[{"name":"MEDIA Group, Laboratorio di Tecnologie dell'Informazione, Rome, Italy"}]},{"given":"Francesco S.","family":"Nucci","sequence":"additional","affiliation":[{"name":"MEDIA Group, Laboratorio di Tecnologie dell'Informazione, Rome, Italy"}]},{"given":"Angelo","family":"Cangelosi","sequence":"additional","affiliation":[{"name":"MEDIA Group, Laboratorio di Tecnologie dell'Informazione, Rome, Italy"}]},{"given":"Maria Beatrice","family":"Ligorio","sequence":"additional","affiliation":[{"name":"MEDIA Group, Laboratorio di Tecnologie dell'Informazione, Rome, Italy"}]}],"member":"320","published-online":{"date-parts":[[1996,7]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"Simulation Games: An Approach to Learning","author":"Adams M.D.","year":"1973","unstructured":"Adams , M.D. ( 1973 ) Simulation Games: An Approach to Learning . 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