“…In contrast, demonstration of discriminant validity regarding many of the putative characteristics of children, mainly boys, with gender identity disorder has been fairly straightforward. Structured parent interviews regarding specific sex-typed behaviours (Green, 1987;Roberts, Green, Williams & Goodman, 1987), parent-report on sex-typed play and behaviour questionniares Bates, Bentler & Thompson, 1973;Green, 1976Green, , 1987Zucker, Bradley, Corter, Doering »& Finegan, 1980;Zucker, Bradley, Doering & Lozinski, 1985), measurement of overt (Doering, Zucker, Bradley & Maclntyre, 1989;Green, Fuller, Rutley & Hendler, 1972;Rekers & Yates, 1976; and covert (Green & Fuller, 1973;Zucker, Doering, Bradley, Alon & Lozinski, 1984) sex-typed play in standardized situations, observation of sex-typed motoric behaviour (Bates, Bentler & Thompson, 1979;Green, Neuberg & Finch, 1983), assessment of gender constancy development (Zucker et ai, 1988), and sextyped indices on projective tests, including the Draw-a-Person (Green, Fuller & Rutley, 1972;Skilbcck, Bates & Bentler, 1975;Zucker, Finegan, Doering & Bradley, 1983), the IT Scale for Ghildren (Green et ai , 1972), and the Rorschach (Zucker, Lozinski, Bradley & Doering, 1992) have all yielded differences between gender-referred probands and comparison groups, which have included sibling, psychiatric and normal controls (see also Rekers & Morey, 1989a, 1989bRekers, Rosen & Morey, 1990).…”