Twenty-four male and 24 female kindergarten and first-grade students were assessed on two conservation-of-number tasks and a conservation-of-continuous-quantity task to determine whether sex differences exist in conservation ability development and to investigate whether sex of examiner influences conservation performance. No significant sex difference effects were obtained, and the sex of experimenter was not found to reliably influence conservation performance. Support was found for the Piagetian notion of stages in conservation development. A discussion of the reliability of the methodology employed, a compromise between Piaget's clinical method and standardized assessments, is also presented.
191The conservation problem has been perhaps the foremost topic of research in Piaget's theory of cognitive development. Exhaustive investigations of the roles of such subject variables as age, sex, and intelligence, along with experimenter variables such as expectancy and methodology , have been linked to various conservation abilities (MogdiI & Mogdil, 1976). In Genevan psychology, the schema of conservation refers to a child's ability to retain , or conserve, the constancy of a stimulus object following a transformation of its physical appearance. Success on a conservation task is taken as evidence of the capacity for logical thought. Conservation ability also serves to delineate a child's transition from the prelogical preoperational period to the logical concrete-operational period (Brainerd, 1978).Conservation of number and continuous quantit y are the first conservation tasks to be mastered by concreteoperational children (Brainerd, 1978;Goldschmid , 1967). According to Piaget, children pass through three global stages in an invariant order from the preoperational (preschoolers) to a transitional stage of inconsistent conservation (6-7 years old), and then on to the third stage of true conservers at the age of approximately 8 years (Brainerd, 1978).A number of studies have been directed to the question of sex differences in cognitive development and performance. Maccoby and Jacklin (1974) have reported that reliable sex differences in cognitive ability do not appear until 13 or 14 years of age. The absence of sex differences prior to this time has been attributed partly to shared experiences (i.e., school curricula) during elementary school. The general conclusion is that report ed sex differences in early cognitive development are secondary, or environmentally induced, differences rather than primary, biologically based, sex differences (Wittig & Peterson, 1979).