@patent {475426,
	title = {Cross-Classroom and Cross-Institution Item Validation},
	volume = {9,508,266},
	number = {US Patent and Trademark Office},
	year = {2016},
	edition = {United States of America},
	chapter = {US},
	abstract = {Anonymous pretesting items for subsequent presentation to participants in a group enable an instructor to validate responses and revise the items accordingly. ... The present invention facilitates anonymous pretesting of items in classrooms (and/or other similar settings) to which the item author has no direct access or knowledge. In some enbodiments, pretesting is performed by software used by the instructor/author in his or her own classroom for other tasks. In various implementations, the software shares information with a central clearninghouse anonymously. The central clearinghouse then automatically matches students in the instructor{\textquoteright}s class with "relevant" students from other classes -- e.g., students that a statistical algorithm predicts will have approximately the same understanding, and will give approximately the same answers, as the instructor{\textquoteright}s class. ...},
	author = {Gary King and Lukoff, Brian and Eric Mazur}
}
