***** To join INSNA, visit http://www.insna.org ***** There seems to be a blindspot in sociology for overlapping groups. We used the Clique Percolation Method: http://angel.elte.hu/cfinder/ that yielded interesting theoretical benefits to specify the significance of structural folding (the overlapping of groups) for entrepreneurial recombination and generative tension. Business groups do tend to overlap a lot, and overlapping groups are better performing, but more unstable. Needless to say, you need a historical dataset to understand what cohesion means (as Simmel, Moreno, and the early theoretical school of network ties clearly saw). http://www.personal.ceu.hu/staff/Balazs_Vedres/papers/vedres.stark.folds.pdf This article appears in the January issue of AJS. _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.