Recently, Flynn 1987, Psyschological Bulletin, 101, 171-191; 1989, Psy
chological Test Bulletin, 2, 58-61 has reported that scores from some
IQ tests have increased significantly over the last few decades and ha
s attributed these gains in IQ to problems in the test measurement of
intelligence. This study investigated whether large IQ increases are a
lso to be observed in Raven's Advanced Progressive Matrices (APM) scor
es in large Australian University samples over the last 30 years. Resu
lts indicated that the APM is internally consistent and stable over ti
me.