The Type 1 Diabetes Genetics Consortium (T1DGC) is an international, multicenter program organized to promote research to identify genes and their alleles that determine an individual's risk for type 1 diabetes (T1D). The primary goal of the T1DGC is to establish resources and data that can be used by, and that is fully accessible to, the research community in the study of T1D. All the information on T1DGC can be accessed at the following web address: http://www.t1dgc.org. A resource base of well-characterized families is being assembled that will facilitate the localization and characterization of T1D susceptibility genes. From these families, the T1DGC is establishing banks of DNA, serum, plasma, and cell lines, as well as useful databases. The T1DGC also sponsors training opportunities (bioinformatics) and technology transfer (HLA genotyping).