Studies on Variation in Portuguese offers a collection of studies on a range of variable phenomena attested within and across varieties of Portuguese. The volume starts out with an overview of current issues in the study of intralinguistic variation and is divided in two parts. Part 1 is dedicated to research on variation within national varieties (Brazilian and European). Here, a multidimensional analysis that combines both the geographic and the social dimensions of variation emerges as a way to identify possible regional specificities and the directionality of some of the variants. Part 2 collects studies that compare the behavior of a particular linguistic variable across different varieties. The variable phenomena discussed concern several levels of grammar and are framed within different conceptions of variation, thus promoting confrontation of theoretical and methodological alternatives. Overall, the volume constitutes a significant contribution to the essential question of how to model variation at different levels.