“…In 1945, the military selected 40 of the most discriminating items of the 60 in the Ravens Progressive Matrices Test, and that test has remained unaltered to the present. Leeuw and Meester (1984, p. 21) used results from 1952, 1962, 1972, and 1982 to trace trends over time, but unfortunately, the 1982 performance was inflated because it was based on an elite group selected from the total population of recruits (Vroon, Leeuw, & Meester, 1984). P.…”