This paper examines four Spanish as a Foreign Language (SFL) B1 level textbooks from different publishers based on the central-northern peninsular standard, with the aim of investigating the inclusion of diatopic variation in them. For this purpose, a quantitative analysis was carried out in which, based on the number of exercises in each textbook, the percentage of linguistic features from varieties other than central-northern peninsular is measured. Additionally, the percentage of these features is calculated by linguistic level (phonetic-phonological, morphosyntactic, lexical-semantic and pragmatic) and by the skills they are practiced in (reading comprehension, written expression and interaction, listening comprehension and oral expression and interaction) or by exercise type. Ultimately, this analysis allows us to determinate which linguistic features from other varieties are most present in the textbooks, in which communicative language activities they are introduced, as well as which peripheral variety predominates in each textbook.
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