In this study, abstract thinking skills which constitutes one of the sub-components of the executive function skills and the theory of mind performances of the inclusive students with mild mental disabilities, born in 2006-2007 (2nd and 3rd graders) and of students with normal development in the same group of age at the same class have been investigated whether there are differences between the two groups of students. The subjects of the study are 38 students showing normal development and also 38 inclusive students who have been diagnosed with mild mental disability. In order to measure theory of mind skills in the research, Sally-Ann, Smarties Test and Chocolate Test were applied. Moreover; abstract thinking skills that is one of the sub-components of executive function skills were measured by using the Raven's Standard Progressive Matrices Test.