The Effect of Instructional – Training Program in gaining Same Conservation Concepts for Primary School Pupils Delayed in their Attainment

. (7) . : . The study has attacked the following main question : What is the effect of using an instructional - training program that helps children of age six- seven years old , of both sex and who have not yet acquired the conservation concepts of number, mass , liquid , length , weight , in addition to the concepts of class inclusion and transitive inference ?