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The differences in raw scores between two versions of the Standard Progressive Matrices Test (SPM) and differences in available norms for one version and the currently studied population were investigated. The SPM was originally designed to measure the general factor of intelligence unrestrained by language. Scores for the untimed SPM version published in Britain in 1983 (SPM British) and the timed SPM version published by the Australian Council for Educational Research (SPM-ACER) were compared for 107 male corrective trainees (Maori, European, and Pacific Islanders) in New Zealand ranging in age from 16 years to 20 years 4 months. Norms for the SPM-ACER for Australian prison inmates and norms for the SPM British for children in New Zealand aged 8 to 16 years were compared for use for the New Zealand offenders. Both forms of the SPM were found equivalent in relation to use by the population sampled in this study, but the two sets of norms were not equivalent. It is suggested that the SPM-ACER should be abandoned for the study sample because the norms appeared to grossly inflate the performance levels of these corrective trainees. The use of the SPM British and New Zealand norms was recommended. Instructions for the comparative testing are included. (SLD)