It is known that students can crowd source solutions to publishers question banks.

But does anyone have experience of crowd sourcing from instructors (creating open educational materials) in a way can limit students ability to see the questions in advance. Some vendors of classroom voting systems appear to be touting this.

http://onlinelearningconsortium.org/conference/2013/et4online/fight-fire-fire-instructor-led-crowdsourcing-assessment-banks-reduces-stud

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