This study is a mixed-method, cross-sectional study that compares the acquisition of request modification in the productions of two secondary school groups (15–16 years old) in two school programs: content and language integrated learning (CLIL) and traditional mainstream (non-CLIL). A total of 192 requests were gathered from both groups by means of an elicitation instrument (a Written Discourse Completion Test – WDCT). The requestive pragmatic moves (external and internal modifiers and request strategies) were analysed according to their pragmatic functions (softeners and aggravators) and a data-driven taxonomy of request modification was elaborated in line with previously developed taxonomies (Blum-Kulka et al., 1989; Alcón Soler et al., 2005) for the data analysis. The results showed that both groups share similarities typical of foreign language learners. Nonetheless, significant statistical differences between them indicated that the CLIL group had a fuller repertoire of request modification strategies, yet their sociopragmatic knowledge is questioned.