Özet:

The aim of the study is to develop a valid and reliable measurement tool through generalizability theory and considering the errors seen in different variation sources. This scale will be used to test students’ performance on media texts during media literacy course. As interscorer reliability obtained via generalizability theory was examined, this study can be defined as a basic research. Turkish candidate teachers of Mersin University during 2014-2015 spring semester participated in the study. To obtain research data, media literacy rubric was prepared in assessing the identical performance tasks. The data obtained from eight scorer related to six performance tasks in the rubric were analyzed according to generalizability theory and the findings were examined accordingly. After eight scorer evaluated 110 students into seven tasks of the rubric, “ö x p x g” pattern was divided into seven variance sources. In addition, generalizability (G) coefficient was found 0.80, and Phi coefficient, 0.73. Considering these results, media literacy rubric proves to be convenient for students’ performance on examining media components. It is important that the rubric developed in the study will be used in different researches with different media tools, and the results will be analyzed. This will help the rubric get standardized.

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