>No doubt this is due, at least in part, to the unrealistic claims of companies trying to sell a product. I agree, many of the claims are overblown. This might be a helpful link. Last year, an adhoc group of genetic genealogists produced Genetic Genealogy Standards designed to help professionals when working with clients. Limitations on each of the three popular tests are defined: http://www.geneticgenealogystandards.com/ All the best, Nathan

Thanks everyone, this has been very informative.