This was a webinar presented to NISO covering the way in which 'Article-Level Metrics' are being implemented by PLoS. Also see: http://everyone.plos.org/2009/05/27/article-level-metrics-at-plos/
Article-Level Metrics at PLoS takes the view that readers need some way to measure, or at least indicate, the 'worth' (or ‘impact’ etc) of a journal article. With over a million articles published per year it’s impossible to read everything & so filtering tools are needed.
Some journals have been experimenting with providing data on online usage, but PLoS is going further than this. We are at the start of a program to provide citations, usage data, social bookmarking activity, media & blog coverage, commenting activity, 'star' ratings etc on all articles we publish. This slides go into the motivation for this program, as well as the way in which we are rolling it out.
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article level metrics
Public Library of Science