Some words in English are derived words, i.e., words with an affix that changes their part of speech, like know "(v)" [right arrow] "knowable (adj)," or meaning, like "pleasant (adj)" [right arrow] "unpleasant (adj)." As a reading teacher, Tom Cobb had always believed that derived words were not particularly…

The calculation of text coverage, that is the proportion of a text covered by a vocabulary of a given size, has become a standardized procedure in recent years. Such calculations provide important information for research and pedagogy about issues such as the goals of vocabulary learning and the ease or difficulty of particular texts. Chujo and…