Yazgan, Akan DenizKincal, Remzi Y.2025-01-272025-01-2720091447-9494https://doi.org/10.18848/1447-9494/CGP/v16i04/46255https://hdl.handle.net/20.500.12428/13071In this study, it's aimed to measure and compare the primary school seventh and eightht grade students formal operational thinking abilities. As a data collection tool in the study Student Profile Questionnare and Group Test of Logical Thinking is used and and practised to the sampling schools in 2006-2007 Spring academic year. At the end of the data analyses there is no significant difference found between the students formal operational thinking abilities in terms of the gender variabl; significant difference found between the students formal operational thinking abilities in terms of the type of the school, academic success, socio-economic and socio-cultural background variables and there is a significant relationship found between the student operational thinking abilities and success in science at the level of r =0.70. © Common Ground, Akan Deniz Yazgan, Remzi Y. Kincal, All Rights Reserved, Permissions.eninfo:eu-repo/semantics/closedAccessCognitive development; Formal operational thinking; Science achievementArticle16441743410.18848/1447-9494/CGP/v16i04/462552-s2.0-77950158311N/A