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Abstract
The last two decades in the evolution of bibliometrics mark a significant turn towards the quantification and measurement of scientific communication beyond the scholarly one and towards a broader assessment of its various impacts on science and society. This chapter summarizes the background and the main characteristics of this evolution, and focusses on the latent and real challenges in the use of the new metrics designed for the measurement of the broader impact of research. In addition to the critical review several examples are given to illustrate the large potential and added value of the new metrics when used judiciously and correctly.
