Child in the preoperational stageMany researchers have been interested in various confounds which are present in Jean Piaget 's stage theories. His studies have postulated that children in the pre-operational stage lack the ability to perform conservation and class inclusion tasks (White, Hayes, Livsey, 2005). The methodologies of the study however, have been criticized by many researchers. Flaws and alternatives found in the standard Piagetian tasks include conversational confusions, perceptual seduction, and linguistic misunderstandings (Light, 1986, Siegel, 1978, 2003, Meadows, 1988). These issues have been addressed with modifications to the standard tasks. Majority of the research have found modified tasks to be better predictors of child 's abilities in conservation and class inclusion tasks. (Light, 1986, Siegel, 1978, 2003, Meadows, 1988).
According to Piaget 's stage theory, children in the pre-operational stage are non-conservers (White et al, 2005). Their tendency of centration causes them to focus on only one aspect of the problem at a time (White et al, 2005). This implies that they are unable to comprehend
References: ight, P. C.(1986). Context, conservation and conversation. In M. Richards. & P. Light (Eds.) Children of social worlds : Development in a social context. Cambridge, U.K.: Polity Press. Meadows S (1988) Piaget 's contribution to understanding cognitive development. In K Richardson & S. Sheldon (Eds.) Cognitive Development to Adolescence. Hove: Lawrence Erlbaum. Siegel, L., McCabe A., Brand J, & Mathews J (1978) Evidence for understanding of class inclusion in preschool children: Linguistic factors and training effects. Child Development, 49, 688-693. Siegal, M. (2003). Cognitive development. In A. Slater & G. Bremner (Eds.) An introduction to developmental psychology. Malden, MA: Blackwell. Chapter 8White. F, Hayes. B, Livesey. D (2005). Evaluating Piaget 's claims: Preoperational period. Developmental Psychology: From infancy to adulthood .Pearson Prentice Hall. Chapter 5