“…In the past, this has been done by describing types of questions. The majority of previous studies have proposed binary levels of question types, such as literal and inferential (e.g., Cohen, 1983;Davey & McBride, 1986;Ezell et al, 1992), definitional versus clarification (MacGregor, 1988), main idea questions versus detail questions (Dreher & Gambrell, 1985;Palincsar & Brown, 1984), and so on. A few studies have described question hierarchies, which categorize questions along a continuum of types or levels.…”