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To assess the number of occurrences of each linguistic feature, we initially thought that if a linguistic
feature appeared only in one part of an exercise, it would be considered as a fraction based on the
number of parts it had. However, after reviewing the divisions of each textbook, we changed our
approach. This was because some textbooks include sub-sections within each exercise while others
do not, leading to significant variation in the number of exercises per textbook. Therefore, we deci-
ded to count the sub-sections of exercises as exercises in themselves when calculating the statistics.
This way, all the textbooks have a similar total number of exercises. Each occurrence of a feature
(from Table 1) or a peripheral variety is counted as one point if it appears in an exercise. It is possible
for different features and/or peripheral varieties to be found in the same exercise; in such cases, one
point is awarded for each feature and/or variety, despite it being a single exercise.
Based on the number of exercises in each textbook 22, we measured the percentage of occurrences
of linguistic features belonging to other varieties (different from Central-Northern Peninsular Spa-
nish) in each student book, the percentage of features by linguistic levels (phonetic-phonological,
morphosyntactic, lexical-semantic, and pragmatic), and by the skills being practised (reading com-
prehension, writing, listening comprehension, and oral expression and interaction), or by exercise
type. Finally, we determined which peripheral variety was predominant in each textbook.
Firstly, we examine the phonetic-phonological features (see Chart 1), which appear more prominent-
ly in AI and AI+, as these are the textbooks that present the highest percentages in a total of seven
features. Regarding intonation and cadence, we observed that the highest percentage is found in
AI (3.74%), followed by NP (3.49%), AI+ (3.32%), NEM (1.72%), and NS (0.54%). AI and AI+ lead in
lengthening of stressed vowels / vowel lengthening with 4.55% and 4.15%, respectively, followed
by NEM (2.94%), NP (2.79%), and NS (0%). In the feature predorsal pronunciation of /s/, AI (2.41%)
and AI+ (2.07%) also show higher percentages, with much lower percentages in NP (1.16%), NEM
(0.98%), and NS (0%). In aspiration of /s/ in final syllable position, AI+ (3.73%) and AI (3.48%) also
have the highest values, while NP (2.33%), NEM (2.21%), and NS (0.73%) have lower values. Similarly,
we find a higher occurrence of the feature pharyngeal aspiration of /x/ in AI (3.48%), followed by NP
(3.26%), AI+ (2.90%), NEM (1.47%), and NS (0.36%). In the feature nasalisation of vowels followed
by a nasal at the end of a syllable, AI+ (1.24%) shows the highest value, followed by AI (1.07%), with
much lower values in NEM (0.49%), NS (0.36%), and NP (0%).
Similarly, AI (0.53%) has the highest percentage for the feature weakened pronunciation of intervoca-
lic /ʝ/, followed by AI+ (0.41%), NEM (0.25%), NS (0.18%), and NP (0%). NP has a higher percentage
of occurrence in five features. For retracted /ʎ/, it shows a percentage of 2.79%, closely followed by
AI+ (2.49%) and AI (2.41%), with more disparate values in NEM (1.47%) and NS (0.36%). NP also has
a higher percentage in weakening of intervocalic /d/ (2.09%), while all the others have much lower
values: AI+ (0.83%), AI (0.80%), NEM (0.49%), and NS (0%). Similarly, the percentages of occurrence
of the feature apicoalveolar pronunciation of /s/ are not very significant, with NP showing the highest
percentage (1.16%), followed by AI+ (0.83%), AI (0.27%), NEM (0.25%), and NS (0%). Another feature
with limited presence in the textbooks is the depalatalisation of /ɲ/, with NP at 1.16%, followed by AI
(0.53%), NEM (0.49%), and AI+ and NS with 0%.
3.2. Results
3.2.1. Percentage of occurrence of linguistic
features in each textbook