Many studies note the difficulties experienced by young children in learning deep writing systems (such as English and French) compared to those for which the link between the spoken and the written is shallower (e.g., Spanish and Italian). A large percentage of these studies are focused on English. As such, more research needs to be conducted with other first languages such as French. The present exploratory study seeks to understand the effects of these kinds of linguistic variable, along with the impact (which has received little attention) of instructional factors, on the competencies of first-grade, French-language writers. Two kinds of instructional context are examined (integrated approach vs code-oriented approach) in two countries (France and Quebec, Canada). The main findings for invented spelling situations within an integrated-approach framework reveal that French and Quebec pupils construct a more complete view of the writing system. This construction includes both units involving the transcription of phonemes by phonograms and units involving the treatment of inaudible, semiographic information by morphograms.