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Recently, informatic labs are set up at schools with great costs in order to make use of computer technology more than before, however there is the lack of valid and reliable tools for evaluating instructional quality of educational software in Turkey. Thus, this study aims to develop a valid and reliable scale for determining instructional qualities of educational software in general. 10 experts were asked to review the trial scale and the construct validity ratio was 0.89 while inter-rater reliability was 0.81. Final version including 50 items is considered to be a useful tool for instructional technologists, academicians and teachers