The research project on schoolchildren's writings began in 2003 at the University of Aosta Valley with the aim of collecting testimonies of children's writings in Italian and French language. The CoDiSV is a digital archive containing children’s exercise books, diaries and other school material produced by children in Aosta Valley in a period from the unification of Italy (1861) to the present. This source, usually considered a poor and "minor" one, is in fact capable to significantly contribute not only to school history, didactics and society studies, but also (and this specially in the multilingual context which characterizes this region of Italy) to historical-linguistic, sociolinguistic and dialectological inquiries. The publication of such documents pursues the primary objective of providing information to the scientific community and promoting interaction with the CoDiSV research group, via the dedicated website; but it also aims to involve all those who, for professional or personal interest, deal with research fields which extend from general education history to Aosta Valley regional history. At present the website (www.codisv.it) contains more than 1.000 digitalized documents, that can be browsed by a dedicated search engine. As far as research products are concerned, since 2011 a publishing series collects linguistic studies and multidisciplinary contributions based on the study of the corpus.