“…The main interest of project work is the motivation of the learner to become involved in the proposal as well as the central attention to the learning processes, referring to which Dewey (1980) claims that "the quality of mental process, not the production of correct answers, is the measure of educative growth" (183); Mediation of social interaction, together with the situated uses of language (discursive genres), as a guide to the actions undertaken by participants in the project. This conception of knowledge building is underpinned by the parameters of sociocultural theory (Vygotsky, 1962;Bakhtin, 1986;Miller, 2011); Cognitive psychology postulating metalinguistic activity and the role played by social interaction in triggering this activity (Karmiloff-Smith, 1992;Gombert, 1992), as well as cognitive and socio-cognitive processes in writing (Flower & Hayes, 1989;Bereiter & Sacardamalia, 1987;Nystrand, 1986;Prior, 2006); Participant implication in the intentional actions related to the goals and the outcomes of the activity, highlighted by activity theory (Leontiev, 1978;Engeström, 1987); Contributions from language sciences, further widening the object of study to language use beyond a sole description of the system of language, adopting sociocultural approaches to the concept of language itself, as well as to the concept of grammar (see Fontich, 2016, for a synthesis). Subsequent studies that scrutinize the learning processes within instructional sequences convey empirical evidence about the dynamism of metalinguistic activity and consider it beneficial for improving writing.…”