Crain (2005) stressed that the way students learn and process information is dependent upon their cognitive ability. In order to determine what stage of cognitive development a person is functioning, Piaget developed a series of tasks which he used to assess children’s levels of cognitive abilities. Dugan (2006) and Bird (2005) said that Bakken (1995) developed a 21-item multiple choice paper-pencil test based on Piaget’s tasks which can be used by classroom teachers who wish to determine students’ stage of cognitive development. Furthermore the research findings of Bird (2005) suggest that Bakken’s Test of Piagetian Stages is a valid assessment of students’ cognitive thinking and is advantageous as it can be grouped administered and does not
