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Comparatives are among the most extensively investigatedconstructions in generative grammar, yet comparativesinvolving attributive adjectives have received a relativelysmall amount of attention. This paper investigates a complexarray of facts in this domain that shows that attributivecomparatives, unlike other comparatives, are well-formed onlyif some type of ellipsis operation applies within thecomparative clause. Incorporating data from English, Polish,Czech, Greek, and Bulgarian, we argue that these facts supporttwo important conclusions. First, violations of Ross's LeftBranch Condition that involve attributive modifiers should notbe accounted for in terms of constraints on LF representations(such as the Empty Category Principle), but rather in terms ofthe principle of Full Interpretation at the PF interface. Second,ellipsis must be analyzed as deletion of syntactic material fromthe phonological representation. In addition, we present newevidence from pseudogapping constructions that favors anarticulated syntax of attributive modification in which certaintypes of attributive modifiers may occur outside DP.