Thurstone and Primary intelligence-verbal comprehension, fluency, number facility, spacial visualization, associative memory, perceptual speed, reasoning
7 clusters of primary abilities, finds most people socre higher in some related clusters than in other clusters
strengths-seven scores of intelligence are more informative than one single score
criticisms-these clusters have a tendency to do just that, and thus actually most people argued gave more proof to a single-underlying (g) intelligence factor