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3D3C worlds can constitute versatile and inexpensive solutions for collaborative learning and training. The embodied human interaction around virtual objects supports a set of activities, enriching the way people learn, work and socialize via graphical representations, and also using features such as Internet browsing, instant messaging, and online voice chat. Nevertheless, research on 3D virtual environments for online education and training identified a set of challenges which include but are not limited to a lack of institutional support, standardization, evaluation methods for measuring learning outcomes, integration between virtual learning environments and virtual worlds, and support for healthy aging and people with special needs. This chapter provides a comprehensive review of 3D3C worlds’ challenges and opportunities by updating the literature with a qualitative analysis covering 49 publications …