Test – retest reliabilities for single-trial scores recorded in the first edition of the Purdue Pegboard Manual ranged from .60 to .76. According to the Spearman-Brown formula, estimated reliabilities for the three trial scores range from .82 to .91. Bass and Stucki (1951) obtained data on 60 industrial education students, which confirmed the previously recorded figures. In 1965 test-retest correlation were determined on the new Purdue Pegboard Test for 28 professional and editorial personnel at Science Research Associates over a 2-week period. The above results may be found in Appendix A, Tables 2-4.