Some empirical guidelines for building testlets:
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Bibliographic Details
Main Authors: Wainer, Howard (Author), Kaplan, Bruce (Author), Lewis, Charles (Author)
Format: Book
Language:English
Published: Princeton, NJ 1991
Series:Program statistics research technical report 91,14
Educational Testing Service <Princeton, NJ>: ETS research report 91,56
Subjects:
Physical Description:10 S. graph. Darst.

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