Adjectives present a great challenge to young language learners not on- ly because they are conceptually complex, but also because they are far less numerous than nouns and verbs in parental input (Sandhofer, Smith and Luo 2000). Furthermore, adjectives depend on nouns in both their form and their meaning (Ferris 1993; Siegel 1980; Taylor 1992; Vendler 1968). As far as form is concerned, adjectives in many languages agree with their head nouns in number, gender and case. Semantically, the same adjective can denote quite different values depending on the compar- ison class denoted by the head noun (e.g. big elephant vs. big mouse).