الفهرس 
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Abstract
The growing need for communication, visualization, and organization technologies in the field of c-lcarning environments has led to the application of virtual reality, and the use of collaborative virtual environments.
But building of the synchronous collaboration learning software system - livc virtual classroom - is complex: it has a large number of parts, many interactions and relationships between these parts, the parts are distributed over some network, and it is difficult to control them. All these previous characteristics of the system make the system design complicated.