In order that the implementation data be credible and stable, the chosen sites were those in which the program had existed from five to fifteen years. Furthermore, these sites were selected for their demographic variety and geographic diversity. The geographic diversity was assured by having each of the experiments in a different state. Psychometric data came from a sample of 2,346 students, grade 5-7, in 10 communities. Coefficient alphas range from .84 to .94 for grade 5 and 7, respectively, indicating satisfactory reliability.
Content validity is claimed because the test samples the elementary reasoning skills taxonomy.
Test development procedures account for construct validity. The content domain is suggested by the 22 skill areas listed previously. Concurrent validity was established by two studies with college freshman. Item analysis informed the elimination of five items, and none were substituted. Test Critiques Vol.