Main Article Content
The research aims to identify the effectiveness of the mantle of the expert strategy in investigating the thinking of the fourth-grade students of biology, where the research sample included two groups, one of them is the experimental group and the number of its students is (33). And the other student represents the control group and the number of students is (34) male and female students by random drawing method. The researchers selected (Almashrue Preparatory School for Boys) from the research community represented by the secondary and middle schools affiliated with it. Babel Education Directorate / Kutha District. The researchers selected the experimental design to control the research variables, and before starting the experiment the researchers rewarded the two research groups. For the purpose of obtaining accurate results with the following variables: (chronological age obtained in months, previous achievement of students, and Daniels test of intelligence), and after making parity between the two research groups, the researchers prepared the application requirements of plans, objectives and tests for the two research groups, and after completing the application of the experiment, the researchers applied their research tool on the two research groups, as the researchers obtained data for the two research groups, as these data were performed statistically by means of a t-test for two independent samples.