This study aimed at investigating the impact of integrating Research Design and Curriculum Evaluation in Curriculum and Instruction academic program at Najah National University. In order to investigate the impact, the researchers thoroughly used the ANCOVA test. The study sample was consisted of 49 students (males and females) which selected randomly from all the students who enrolled in the courses in the same semester. 2 groups (excremental and control) were formed for each course, the experiential group studied each course based on integration curricula through problem solving, and the control group studied each course based on problem solving. The study used and achievement test and a the content of each course were redesigned for the purpose of the study. The results reveled that there were a statistical significant difference between the control and the experimental group in favor of the excremental group.