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The primary objective of this study is to research the effects of web based concept maps and structured grids prepared for the unit of human and environment, which is in the curriculum of primary school 7th grade science and technology lesson, on students' concepts and misconceptions. The sample of this study which was conducted with quasi-experimental research approach consisted of 64 students in two different classes of a primary school in Samsun (Control:32, Experimental:32). In the control group, classic structured grids and concept maps were used in addition to traditional teaching approach. In the experimental group, web-based structured grids and concept maps were used. Three stage concept achievement test, which was a reliable and valid test developed by the researchers, was conducted on both groups as pre-test and post-test. Independent t test was applied on the data obtained from concept diagnosis test with the help of SPSS 21 package program. At the end of the study, a difference was found in concept achievement in favor of the experimental group. In addition to this, the decrease in misconceptions was found to be higher in the experimental group. [ABSTRACT FROM AUTHOR]