As a reference resource we took the Basic Italian Vocabulary by De Mauro 2000, including a list of 7000 words highly familiar to native speakers of Italian.
we calculated two different features corresponding to: i) the percentage of all unique words (types) on this reference list (calculated on a per-lemma basis); ii) the internal distribution of the occurring basic Italian vocabulary words into the usage classification classes of 'fundamental words' (very frequent words), 'high usage words' (frequent words) and 'high availability words' (relatively lower frequency words referring to everyday life).