A study by the University of Cincinnati found 20 to 40 percent of Americans will provide an opinion when they do not have one because of social pressure, using context clues to select an answer they believe will please the questioner.
They are questions that are often asked to obtain a specific answer and are therefore good for testing knowledge.
This is based on Worley's central arguments that there are two different kinds of open and closed questions: grammatical and conceptual.
He argues that educational practitioners should be aiming for questions that are "grammatically closed, but conceptually open".
OQM encourages a style of pedagogy that values genuine enquiry in the classroom.
It provides teachers with the tools to move beyond what Worley calls "guess what's in my head" teaching, that relies on closed and leading questions.