Abstract
The one-bole test was developed to provide a situation in which unlike that in the Purdue peghoard and similar teste, the reach, grasp, move and position elements were consistent and their rate of improvement measurable. Results support the hypothesis tlmt measurements of rate of learning or of performance after 600 cycles of practice have a higher concurrent and predictive validity of production output than measurements of initial performance on the test. The one-hole test has a mean predictive validity of 0-75 (N = 228) between test scores and rate of learning in the training school; and a mean concurrent validity of 0-66 [N = 307) between test scores and mean production performance of experienced operators. Norms (N = 1422), reliabilities (W=158) and correlation of the one-hole test scores with anthropometric measurements, personality, intelligence, age and other manual dexterity tests are discussed.