Hwang,Yong-soo. Kim, Young-Suck. 1998. The Optimality of Interrogatives in English. Studies in Modern Grammar 14, 263-283. The purpose of this paper is to briefly review head movement and operator movement within Minimalist Program, point out the assumptions posed to cover all kinds of interrogatives, and analyze the syntactic structures of English interrogatives on the basis of Optimality Theory. In the framework of Minimalist Program, wh-questions are CPs headed by COMP with a (WH] specifier-feature, and wh-movement(movement of wh-operator expressions into spec-CP) is motivated by the need to check the [WH] specifier-feature of COMP. Auxiliary Inversion involves a head movement operation whereby an auxiliary moves from INFL to COMP because an interrogative COMP is strong by virtue of containing an abstract question affix and a strong head position must be filled. In the analysis of optimal interrogatives in terms of Minimalist Program, we need some assumptions such as enlightened self-interest, null-operato no questions, null-complementizer in embedded questions, and a strong COMP of English questions. Optimality Theory proposes an input and an output and a relation between the two. The relation between input and output is mediated by two formal mechanisms, GEN and EVAL. EVAL uses the language particular ranking of constraints from the universal set of constraints, which are violable. An optimal output form for a given input is selected from among the class of candidates: a form, for every pairwise competition involving it, best satisfies the highest-ranking constraint on which the candidates conflict, is optimal. Under OT, wh-movement, inversion of the subject and auxiliary verb and the appearance of the auxiliary verb do can be explained consistently by the interaction of universal constraints.