The Survey of Early School Adjustment Difficulty provides a single composite score indicating difficulty with the transition to school based on the mean of the 11 items. Internal consistency reliability based on kindergarten and first grade children in a rural sample ranged from .90-.91.
For more information, see:
Nathanson, L., Rimm-Kaufman, S.E., & Brock, L.L. (2009). Kindergarten adjustment difficulty: The Contribution of children’s effortful control and parental control. Early Education and Development, 20(5), 775-798.
Ponitz, C. C., Rimm-Kaufman, S. E., Brock, L. L. & Nathanson, L. (2009). Early adjustment, gender differences, and classroom organizational climate in first grade. The Elementary School Journal, 110(2), 142-162.