Özet:

The aim of this study is to investigate the effects of journal writing on achievement of 8th grade students on the surface area and volume of geometric solids and on geometry self-efficacy. The study was carried out with 40 8th grade students at a public school in Eagean Region. One group with 20 students was assigned as the experimental group and the other 20 student-group was assigned as the control group. Different from the control group Experimental group engaged in journal writing activities on the surface area and volume of geometric solids. In the study, two achievement tests [Surface Area of Geometric Solids Test (SGST) and Volume of Geometric Solids Test (VGST)] were used to measure the gain scores of students and self-efficacy of students towards geometry was evaluated by self-efficacy towards geometry scale which was developed by Cantürk-Günhan and Başer (2007). The tools were administered as pre-test and post-test. The data of the study were analyzed by Mann Whiney-U test and The Wilcoxon Matched-Pairs Signed-Ranks Test by using SPSS 16 packaged software. The results of the study suggest that achievement of the students on the surface area and volume of geometric solids and the self-efficacy of the students towards geometry in each group differed significantly. 

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