The primary purpose of the present study is to develop teacher participation in decision making scale to find out teachers' states of participating in decision making in studies to be conducted. Literature review was conducted and an item pool including 30 items was formed and the draft form was given to 307 teachers working in 65 high schools of Mersin city centre during the 2017-2018 Academic Year. Exploratory factor analysis was conducted with the help of the data obtained and the scale form

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... including three dimensions and ten items was reached as a result of the analysis. The scale form including ten items was given to 193 teachers from the same universe, confirmatory factor analysis was conducted with the help of these data and scale construct was tested this way. Exploratory and confirmatory analysis results showed that the scale form which included ten items and three dimensions could be used in studies to be conducted related with teachers' states of participating in decision making in the field.