One of the most persistent problems in Christian-Muslim relations over the centuries has been the tendency of each group to judge the other by a set of standards and criteria quite different from the standards and criteria used in assessing itself. Hugh Goddard argues that in the 20th century such a procedure is no longer admissible. He goes on to point out some of the useful insight which may be gained - by the members of both communities in their understanding both of their own faith and of that of the other - by an attempt to apply the same criteria to both traditions.