Comparison of G and Phi coefficients estimated in generalizability theory with real cases

This study aims to compare the G and Phi coefficients as estimated by D studies for a measurement tool with obtained from real cases in which items of differing difficulty levels were added also determine conditions under reliability closer reality. The group this research consisted 80 seventh-grade students various public private secondary schools provinces Ankara, Istanbul, Adana Turkey. Four raters who served Turkish teachers Ankara included study. A data collection consisting 12 tasks was prepared measure participating seventh grade students’ written expression skills Turkish. equation through observed only when six item indexes close mean test such way that never changed. In other cases, where changed because addition easy or difficult tasks, it determined similar, but they had different values.