The primary goal of this book is to provide an analysis of the several positions where the subject may surface in European Portuguese. Departing from an architecture of the clause as sketched in early minimalist work, containing two subject-related functional categories above VP (AgrP and TP), it is shown that the subject may surface in all potential landing sites: Spec,AgrP, Spec,TP and Spec,VP. Moreover, just like any other argument of the clause, it is claimed that subjects also have the possibility of surfacing in a left-dislocated position, arguably adjoining to the clause's left periphery. Under this approach, three independent results are derived: i) an explanation is found for the patterns of word order variation; ii) syntax proper may be reduced to its own tools, not having to manipulate semantic, discourse or prosodic variables; iii) the intuition that European Portuguese is an SVO language is derived: this word order corresponds to the one in which the subject occupies the only specifier position in which the other interfaces play no role.