“…Hom 1976 andRichards 1976) is a reasonable estimate of central tendency, it must be recalled that the actual DT X IQ rs vary widely depending upon the nature of the DT tests, the heterogeneity of the sample, and apparently the nature of the testing situation. (For reviews of research dealing with this latter point, see Hattie 1977Hattie , 1980 The possibility that IQ may be a prerequisite to DT performance was proposed by Guilford (1967) and studied by examining relevant scatterplots for triangularity (Guilford 1967, Guilford & Christensen 1973, Schubert 1973, Richards 1976. While this line of investigation is far from conclusive, some DT and IQ scatterplots do seem to form a quasi-triangle compatible with Guilford's hypothesis.…”