We present the results of the 2007 Paternity Testing Workshop of the English Speaking Working Group of the International Society for Forensic Genetics. The exercise included paternity testing of blood samples from a mother, a child and an alleged father. The laboratories were encouraged to answer questions concerning their laboratory routines and a paper challenge was distributed in order to compare statistical calculations. A total of 69 laboratories participated. The laboratories used a total of 41 autosomal STRs and PCR-investigated VNTRs, 22 Y-chromosomal STRs, 11 X-chromosomal STRs and 7 VNTR systems investigated with RFLP. The rate of typing and reporting errors was 0.2%