The aim of this study is to develop a valid and reliable instrument to determine the level of school administrators' diversity leadership based on teachers' perceptions. For this purpose, an item pool was created which includes 68 questions based on the literature, and data were obtained from 343 teachers. Exploratory factor analysis (EFA) was…

Six item bias detection techniques (distractor analysis, the Mantel-Haenszel procedure, Angoff's delta plot, Angoff's modified delta plot, Stricker's partial correlation index, and direct comparison of item difficulties) were compared for their ability to identify biased items at three stages of test development. The techniques were applied to…