**ABSTRACT**

This study aimed at evaluating the effectiveness of in-service training courses on the sixth grade teachers of Andimeshk. This was a descriptive survey. The population consisted of all 115 sixth grade teachers of Andimeshk selected by using complete census. A researcher-made questionnaire was used to collect information on the effectiveness of in-service training courses on aspects of attitudes, skills and knowledge. The reliability of each category was calculated by using Cronbach. To analyze the data, descriptive statistics and inferential statistics like Friedman rank test, chi-square test of goodness of fit, and one- sample t-test were used. The results showed that teachers evaluated the effectiveness of in-service training courses on their attitudes, skills and knowledge to be above the average.

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