This volume is the Portuguese translation-adaptation of previous books on metalinguistic awareness, the first one of which was conceived in Italian by Maria Antonietta Pinto in 1999 as "La consapevolezza metalinguistica. Teoria, sviluppo e strumenti di misurazione" (Istituti editoriali e poligrafici internazionali. Pisa-Roma), then followed by an English (Pinto, Titone, Trusso), a Spanish (Pinto, Titone, Gonzales Gil) and a French one (Pinto, El Euch) in 1999, 2000 and 2015, respectively. The introductory chapter first delineates the concept of metalinguistic awareness in all its definitional complexities and developmental aspects and then proceeds to describing three tests to measure metalinguistic abilities at three age levels: 4-6, 9-14 and 16 to adulthood. With respect to the abovementioned volumes on metalinguistic awareness, this Portuguese versions is an updated work that took into account the phonological, lexical, grammatical, morpho-syntactic and stylistic specificities of European Portuguese for what concerns the translation of the items of the metalinguistic tests it describes. This Portuguese volume extends to four the range of the Romance languages into which the metalinguistic abiltiy tests are now available, thus contributing to international research on intercomprehension in these languages.