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Thanks Andrew, I am in fact aware of that publication, and it is very useful. My understanding, from a number of sources, including comments Thom Hickey (I think that was Thom? I actually missed his name in my notes) made at the FRBR Implementer's Group meeting at ALA Midwinter, is that the algorithm current OCLC products use for work-set grouping is not limited to that published algorithm, but ends up being quite a bit more sophisticated than that. Thom (I think!) also said that different OCLC products used slightly different algorithms at the moment (for instance, FictionFinder vs. xISBN). I asked at the Implementor's Group meeting in December if OCLC planned to share the more sophisticated algorithms and tweaks currently being used, and he said he wasn't sure. It is of course OCLC's right as an organization to decide what information to share and when. Jonathan Houghton,Andrew wrote: > Actually, with just a little bit of research, you would have > found the following information: > > <http://www.oclc.org/research/software/frbr/> > > OCLC's FRBR algorithm has been publicly available since sometime > in 2005. The algorithm was used for xISBN and is being used for > a number of ongoing projects in the Office of Research. > > > Andy. > > -- Jonathan Rochkind Sr. Programmer/Analyst The Sheridan Libraries Johns Hopkins University 410.516.8886 rochkind (at) jhu.edu