The authoress focuses on the linguistic phenomenon of multiple quantification. Her aim is to defend the grammatical ambiguity hypothesis, the view that a multiple quantified sentence of a language L is semantically ambiguous if a grammar for L (understood as the cognitive mechanism that maps sentences onto meanings) encodes a class of interpretations - specifies the space of possible interpretations of that sentence. She argues both against the position of a unitary semantics: ambiguous sentences encode a single sense, a pragmatic (context dependent) derivation is essential in arriving at the other interpretations; and against that of radical pragmatics: ambiguous sentences encode no senses at all, a pragmatic derivation is essential in arriving at any interpretation (at all). In her attempt at providing a plausible account of semantic ambiguity, the authoress uses a combination of approaches and methods: theories of grammar (such as Government and Binding Theory), tools of mathematical logic, linguistic studies and the results of psycholinguistic experiments.