The Alliance advises a voluntary three copy duplication threshold for books. Library staff apply this consortial guideline when possible within the context of their respective collection and user needs.
Below are documents related to the development of the threshold.
- Threshold Considerations (2009) (PDF)
- Unneccesary Duplicate Threshold Guideline (Oct. 2010) (PDF)
- Threshold Recommendations for Council (Nov. 2010) (PDF)
- Threshold Pilot Assessment Procedures (Feb. 2011) (PDF)
- GOBI Data Analysis Example for Threshold Pilot (Jan. 2011) (XLS)
- Threshold Pilot YBP Procedures for Selectors (Jan. 2011) (PDF)
- Threshold Pilot Presentation (Jan. 2011) (PDF)