***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** Carl We use attribute data that is at a very detailed knowledge level to predict the propensity for interaction under both homophilly and expertise based rationals for interaction. Moreover, we have been able to use this informtion to predict change in the network over time. There is evidence from cognitive psychology that in fact such knowledge mediated data is at the basis of social interaction. Note - gross level attributes and very generic categories of knowledge are usually insufficient to predict the structure. You really need a finer grain of detail. see these papers: Carley K. (1992). A Theory of Group Stability. American Sociological Review. Carley, K. (1990). "Group Stability: A Socio-Cognitive Approach." In Advances in Group Processes. edited by E. Lawler, B. Markovsky, C. Ridgeway and H. Walker, Vol. 7, p. 1-44. Greenwich, CT: JAI. Kathleen M. Carley & David Krackhardt, 1996, "Cognitive inconsistencies and non-symmetric friendship." Social Networks , 18: 1-27. Kathleen Carley _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.sfu.ca/~insna/). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.