After their inauguration in July, 1987, in Leuven, Belgium, these workshops have been held twice more in Leuven, once in Helsinki, and five times at the Institute for Behavioral Genetics, Boulder, Colorado. Each has been tremendously successful (and oversubscribed). Papers resulting from the inaugural workshop were published in a Special Issue of Behavior Genetics: Twin methodology using LISREL, 19(1), 1989. The course material from the previous workshops has now been published as a methodology handbook by Neale, M. C., Cardon, L. R., & 11 contributing authors as Methodology for Genetic Studies of Twins and Families, Dordrecht, The Netherlands: Kluwer Academic Press, 1992.

The next workshop will be held again in Boulder, Colorado, the first week of March 1998, with David Fulker and John Hewitt as local hosts. The application programming will be based on the package, Mx, developed by Dr. Mike Neale for the flexible analysis of genetically-informative data. The Mx home page is at

This course is intended to be introductory. Participants interested in more advanced work (e.g., those who have attended earlier workshops) should consider attending the advanced workshops planned for 1999, 2001, and 2003 (if funding requests are successful) in Boulder, or September 1998 in Leuven. (For information about the Leuven workshop contact or

The registration fee will be $300.00, payable by January 10, 1998. Accommodations are being reserved at the Regal Harvest House, Boulder. Details of local arrangements, registration, and accommodation are available from the workshop secretary, Carol Case. A home page is being established on the World Wide Web at

The provisional faculty roster includes:
L. Eaves [Academic Director], H. Maes, M. Neale Richmond, VA, USA
A. Heath St. Louis, MO, USA
N. Martin Brisbane, Queensland, Australia
D. Boomsma Amsterdam, The Netherlands
P. Sham London, UK
D.Fulker, J. Hewitt, S. Cherny Boulder, CO, USA
The course will include: Use of twins in genetic analysis; summarizing variation; univariate twin analysis; between group heterogeneity; path analysis; multivariate twin analysis; multiple raters; sibling effects; categorical data; power analysis; quantitative trait loci (QTL). Hands-on analysis will be emphasized employing networked terminals.

An application form can be printed from A provison schedule is avalible at Further information may be obtained from John Hewitt, or the workshop secretary, Carol Case,
IBG, University of Colorado, Boulder, CO 80309-0447, USA; Telephone: 303/492-7363; FAX: 303/492-8063;
E-mail:, or

Financial support for this workshop is provided by grant MH19918 from the National Institute of Mental Health.

The IBG home page or the Twin Workshop home page.

Sam Hewitt.