This series develops thinking skills through analogies in language arts, social studies, science and math. Five types of analogies are covered in each level: descriptions, comparisons, categorizing, series, and causes.

There are a few pages at the beginning that explain analogies, followed by “pre-analogy” exercises.  Then there are four levels of complexity: novice, apprentice, masters, and super masters. Each book provides additional practice and mastery exercises. A separate Answer Key is available for each level.