This volume investigates the universal existence of adjective classes across human languages while analyzing the significant variation in their size, grammatical properties, and syntactic behavior. Authors Alexandra Y. Aikhenvald and R. M. W. Dixon, both prominent figures in linguistic typology, synthesize cross-linguistic data to challenge the assumption that adjectives function identically across all tongues. They argue that adjective classes range from open, productive categories to small, closed sets, often mirroring the grammatical characteristics of nouns or verbs depending on the specific language structure.

Experts recognize this work as a foundational text for understanding the diversity of word classes in linguistic typology. Scholars frequently cite the authors' rigorous methodology as a standard for comparative grammatical research.