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These thinking skills books are among our favorites because of their tremendous scope. They develop four basic analytical skills (similarities/differences, sequences, classification, and analogies) through both figural and verbal problems. In addition, there are problems dealing with deductive reasoning, map skills, Venn diagrams, mental manipulation of two-dimensional objects, and much more. Studies have shown that students using these books have raised their national test scores significantly in both content and cognitive tests! What's more, these books are never boring!