Identification + Classification = GAIA

With no surprise, the first Google hit for 'Identification + Classification' is about Astronomy. http://www.mpia-hd.mpg.de/GAIA/
The GAIA project is aiming at identifying and classifying over 10^9 light sources, sorting them in stars, solar system objects, galaxies, quasars and the like. Astronomers have always led the way in classification and inventories. This is the next step ...