| Summary: | The purpose of this study is to investigate the effect of usage of an online casestudy library including teacher case studies about technology use on teacher education. For this purpose, the case study library is utilized in the teaching practice class of preservice teachers from the Department of Geography Education. This research is designed according to one group pre-test/post-test modeling to investigate effects of the usage of the library on preservice teachers’ Technological Pedagogical and Content Knowledge (TPACK) and teacher self-efficacy beliefs. To analyze the data obtained through pre- and post-tests, t-test is implemented. The findings of the study reveal that there is statistically significant difference in the post-test scores of TPACK, PK, CK, TCK, and PCK subdimensions compared to the ones of pre-tests. Moreover, in the other sub-dimensions, TK and TPK post-test scores increase but they are not significantly different from the pre-test scores. Similarly, the scores in all sub-dimensions of teachers’ self-efficacy beliefs scale increase compared to the pre-tests scores
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