Proponents of interactionism assert that language acquisition has both biological and social components that is, it is the result of the application of the principles propounded by the behaviorists and nativists. According to Vygotsky, children can only do so much with their own ability (zone of actual development), but with the social environment surrounding them, help and support from their parents, peers, and teachers (MKO's), they can soar to greater heights and achieve great things (zone of proximal development).