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# 1.3: Quality Control

Created by: CK-12

Version 0.9: All chapters in Release $0.9$ underwent three levels of review:

• A technical review by a university research physicist
• Peer review by three other authors
• Review by several students including three 10th grade high school students and a college freshman (non-science major)

Version 1.0: All chapters in Release $1.0$ underwent one additional level of review via the public feedback we received from our open mailing list.

All content is configuration controlled. While it can be copied and edited by users on the CK-12 FlexBook Platform http://flexbooks.ck12.org/flexr/book/vaflexbook the original FlexBook content cannot be changed by readers. The chapters will be updated from time to time based on the authors’ experiences and comments from readers and users. These updates will be noted by their release numbers.

Feb 23, 2012

Aug 26, 2014