The number-joining test, originally developed by Tsai in 1939 to predict success of Chinese pilots, was administered to 481 California State College students. Product-moment correlations of B-form with a “motor,” a “perceptual,” and a “coding” test were .33, .47, and .58 respectively, indicating that the test involves more central than peripheral functions. Test reliability is evidenced by r of .71 between alternate forms, of .93 between 4- and 6-min. segments and practically identical mean scores for alternate forms. Group testing is just as reliable as individual testing; however, male Ss perform significantly better in a group than when tested individually.
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