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Continued developments of quantitative spectroscopy and related atomic physics are originating from inertial and magnetic fusion research. In almost all experimental facilities, non-equilibrium phenomena are now a central issue and the interpretation of related spectroscopic data is a great challenge. We discuss new general diagnostic/spectroscopic approaches and usual point of views: high density methods and high density atomic physics for magnetic fusion research like ITER and the Virtual Contour Shape Kinetic Theory VCSKT which unifies low and high density plasma regimes and therefore allows to employ complex satellite transitions in non-equilibrium, non-LTE and non-Coronal plasmas. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]