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Here we review some of the main issues related to multi-wavelength sourceidentification and characterization, with particular emphasis on the field ofX-ray surveys carried out over the last years. This complex and time-consumingprocess is going to represent one of the main difficulties over the comingyears, when significantly larger surveys, both in area and depth, will becarried out with the new generations of space- and ground-based facilities likee.g. eROSITA, WISE, VISTA, Pan-STARRS, and LSST. The Virtual Observatory canoffer a reliable way to approach to a new concept of data handling andmulti-wavelength source characterization, provided that uniform and rigorousdata analyses and extensive quality checks are performed.

Multi-wavelength data handling in current and future surveys: the possible role of Virtual Observatory