The recent findings described , the use of tasks that vary on their linguistic and metalinguistic demands enables us to more fully delineate bilingual metalinguistic development. whether or not bilinguals exhibited a processing advantage was dependant on both the nature of the task demands and their bilingual experience.A bilingual advantage was only observed when bilinguals had equivalent language proficiency to the monolingual control group. in the grammaticality judgment and verbal fluency tasks that required high levels of executive control, our research indicates that superior executive control enables bilinguals to compensate for weaker language skillsand greater bilingual experience enables improved control mechanisms . these results serve to refine our understanding of how both executive control and language knowledge jointly influence metalinguistic awareness development.