Hong Bae Lee. 2003. The Spec-Head Relation: its Reign and Fall. Studies in Modern Grammar 32, 111-139. The Spec-Head relation has been one of the most important syntactic relations in generative grammar. The present paper will review the consequences of adopting the Spec-Head relation as a kind of government relation in the GB-theory, and the expanding role of the relation in the early Minimalist Program, and will investigate some of the (unnecessary) assumptions and principles that have to be postulated by employing the relation in linguistic analysis. Then, I will discuss the consequences of the claim that the Interface Conditions (IC?). I will also point out that the IC? requires we reconsider/reanalyze Ura`s (1996, 2000) multiple feature checking analysis and Yang`s (2000) multiple Agree analysis of the so-called "multiple Spec constructions" in Languages like Korean and Japanese. I will propose a new parameter for the constructions for further research.