An overriding requirement of atomic and molecular data for spectroscopy of fusion plasmas is identified as a need to ensure that the most recent and highest quality fundamental data is incorporated in analysis and interpretation of emission from plasmas and that it enters consistently into large scale plasma modelling. It is argued that this can only be achieved by accompanying the product of modern large scale atomic reaction coefficient calculations with an equally sophisticated organisation and utilisation structure for it's exploitation. The paper describes a possible form for such a structure which can address both the present and anticipated developments in fusion up to a demonstration reactor. Various illustrations are given of practical implementation of parts of such an atomic data and analysis structure which has supported spectral studies at the Joint European Torus experiment.