The 2010 NIST Speaker Recognition Evaluation continues a series of evaluations of text independent speaker detection begun in 1996. It utilizes the newly collected Mixer-6 and Greybeard Corpora from the Linguistic Data Consortium. Major test conditions to be examined include variations in channel, speech style, vocal effort, and the effect of speaker aging over a multi-year period. A new primary evaluation metric giving increased weight to false alarm errors compared to misses is being used. A small evaluation test with a limited number of trials is also being offered for systems that include human expertise in their processing.