摘要：AbstractReliability and validity of data gathering tools used in postgraduate theses are crucial to obtain error-free evaluation results and to ensure that the data gathered through these means serve their purpose. This study investigated the presented evidence regarding the reliability and validity of data gathering tools (measurement tools) used in master's and PhD theses. The population of the study undertaken via document review method was composed of a total of 111 theses obtained between the years of 2011-2014 from the Institute of Educational Sciences of a university situated in the Western Black Sea region of Turkey. 93 of these theses were master's theses whereas 18 were PhD theses. Sample of the study was composed of a total of 46 theses open to publication (39 master's theses, 7 PhD theses). Data were analyzed descriptively (%, f). Findings point to the important problems faced during proving process of reliability and validity of data gathering tools used in theses. Suggestions were provided in the light of the findings.
