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The analyst and consultancy company Gartner has developed several diagrams that have become widely used graphic forms and standard tools for evaluation and decision making support in organizations. This case study presents their most famous diagrams, the Magic Quadrant and the Hype Cycle. The magic quadrant is a matrix that synthesizes information about vendors and service providers, while the Hype Cycle summarizes the life cycle status of different technologies in a domain. The case study highlights the benefits and risks of such visualizations, the typical uses and similar forms created by users and competitors. Future possible developments of the diagrams conclude the case study.