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Bonn's Use Factor
- Developed in 1974 by G. S. Bonn.
- Calculation: call number % of total circulation/call number % of total holdings
- Ideal result in terms of collection usage is 1.
- Results above 1 indicate that a collection is overused; results less than 1 indicate that a collection is underused.
Selected CNU Results
| Call Number |
% of Circulation |
% of Collection |
Use Factor |
| D |
13.34% |
7.97% |
1.67% |
| A |
.2928% |
.1938% |
1.51% |
| L |
1.3637% |
3.6368% |
.3749% |
| Z |
.1524% |
.5046% |
.302% |
Mill's Percentage of Expected Use
- Developed in 1982 by T. R. Mills
- Used Bonn's Use Factor to predict a collection's percentage of expected use.
- Calculation: Bonn's Use Factor * 100 = % of expected use.
- Percentages over 100% indicates an overused collection; less than 100%, an underused collection.
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