Same-sex and cross-sex reliability and concurrent validity of Strong-Campbell Interest Inventory
Reliability and concurrent validity data for the Strong-Campbell Interest Inventory (SCII) were developed for a sample of 180 students scored on appropriate sex norms and scales. These data were compared with data for the Strong Vocational Interest Blank (SV.IB), data reported in the SCII Manual, and data for the same sample scored on the opposite sex's norms and scales and scored disregarding sex. Two-week test-retest reliability correlations were approximately .90. Agreement between high scores and self-reported curriculum and occupational preferences ranged from 32% to 60%. The SCII has same-sex reliability and concurrent validity near those of the SVIB. Cross-sex scores are not significantly less reliable and valid. Scoring on all Occupational scales produces significantly higher concurrent validity. The appearance of a new edition of a test leaves many users skeptical until its technical and practical value is demonstrated by more data than are given in the test manual. The new merged form of the Strong Vocational Interest Blank (SVIB), the Strong-Campbell Interest Inventory (SCII), incorporates changes which make it more than just a new edition of the SVIB. The most significant change is that one form of the SCII is provided for both men and women. A result of combining the men's and women's forms is that in addition to appropriate sex (same-sex) scores, a subject's scores on the scales of the opposite sex (cross-sex) are available. Strong (1943, 1966), Perry and Cannon (1967, 1968), Campbell (1971), and the Association for Measurement and Evaluation in Guidance Commission on Sex Bias in Measurement (1973) recommended against using one or all of the cross-sex scales. Seder (1940), McCornack (1956), Laime and Zytowski (1963), and Stanfiel (1970) have said that the men's form or some of the men's scales were useful for some women. Campbell (1974) recommended that a person