This report presents results of a concurrent validation study for the Chicago District Council of Carpenters Apprentice and Trainee Program. Its purpose was to develop a fair screening device for applicant selection. Advanced apprentice carpenters in three specialities--construction, cabinet making, and floor covering--were administered the Ball Aptitude Battery (BAB) in the fall of 1980. Performance measures (overall grade point average (GPA) and instructor's rating) were also collected. Useable data were collected on 184 individuals. Eight of the 14 tests in the BAB correlated significantly with both GPA and instructor's rating. Multiple regression analysis results showed that four of the tests--Vocabulary, Paper Folding, Numerical Computation (Numerical Ability-I), and Numerical Reasoning (Numerical Ability-II)--significantly correlated with apprenticeship performance, as measured by GPA and instructor ratings. Validity coefficients were almost equal for both majority and minority ethnic groups using a composite score of these four tests as a predictor and GPA as a criterion. It is recommended that the four BAB tests be used to assist in the selection of applicants to the Apprentice Carpenter and Trainee Program. Appendices contain: (1) course skills and related test aptitude factors; (2) specialty job descriptions; (3) intercorrelation statistics, and (4) regression lines. (Author/BS)