** Cross-Posted **

      Thomas, Chuck &  McDonald, Robert H. (2007)
      Measuring and Comparing Participation Patterns in Digital
      Repositories: Repositories by the Numbers, Part 1.
      D-lib Magazine 13 (9/10)
      http://www.dlib.org/dlib/september07/mcdonald/09mcdonald.html
      doi:10.1045/september2007-mcdonald

      EXCERPT: "As for mandatory-deposit repositories, the limited
      available data indicate authors represented in such repositories
      tend to contribute more of their intellectual output. Sale (2006)
      predicted institutions establishing deposit mandates were likely
      to see such results within three years of implementing these
      policies... This study's findings only reinforce such predictions
      and arguments favoring institutional mandates. As the data in this
      article show, a mandate is arguably the "tipping point" described by
      Gladwell (2000) that can make depositing behavior among scholars not
      just widespread, but also more of an ingrained and complete behavior."