Designing Collection Experiences:6. Objectives
www.whatwouldranganathando.orgNovember 12, 2013
Waterloo Public Library
All you need to know about setting collection objectives
𝑨𝒈𝒆=𝑺𝒊𝒛𝒆𝑨𝒅𝒅𝒔
𝑨𝒈𝒆=𝑺𝒊𝒛𝒆𝑨𝒅𝒅𝒔
𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝐷𝑖𝑠𝑐𝑎𝑟𝑑 𝐴𝑔𝑒=𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑖𝑡𝑒𝑚𝑠𝑖𝑛𝑎𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛
𝐴𝑛𝑛𝑢𝑎𝑙 𝑖𝑡𝑒𝑚𝑠𝑎𝑑𝑑𝑒𝑑
In a stable collection, which means:𝐴𝑛𝑛𝑢𝑎𝑙 𝑖𝑡𝑒𝑚𝑠𝑎𝑑𝑑𝑒𝑑=𝐴𝑛𝑛𝑢𝑎𝑙 𝑖𝑡𝑒𝑚𝑠𝑑𝑒𝑙𝑒𝑡𝑒𝑑
Policy Assumptions
Fun with actuarial science
UnitTimeper Entrants
Size Population Expectancy Life Average
Expectation of Lifefor a stable population
UnitTimeper Entrants Expectancy Life Average Size Population
Expectancy Life Average
Size Population Unit Timeper Entrants
UnitTimeper Entrants
Size Population Expectancy Life Average
7001070 UnitTimeper Entrants Expectancy Life Average Size Population
1070
700
Expectancy Life Average
Size Population Unit Timeper Entrants
7010
700
UnitTimeper Entrants
Size Population Expectancy Life Average
Weeding Age, Collection Size, and Items Added
Added Items Annual Age WeedingAverage Size Collection
Age WeedingAverage
Size Collection Added Items Annual
Added Items Annual
Size Collection Age WeedingAverage
𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝑊𝑒𝑒𝑑𝑖𝑛𝑔 𝐴𝑔𝑒=𝑀𝑒𝑑𝑖𝑎𝑛 𝐴𝑔𝑒×2
7007010Added Items Annual Age WeedingAverage Size Collection
7010
700
Age WeedingAverage
Size Collection Added Items Annual
1070
700
Added Items Annual
Size Collection Age WeedingAverage
Other Expectation of Life Applications
Dayper Loans Average
FileRequest in Items Average Time TurnaroundLoan ry Interlibra Average
nCirculatioDaily Average
Shelved Be To Items Average Time Turnaround Shelving Average
nCirculatioDaily Average
Out Items Average PeriodLoan in Days Average
Policy Assumptions for Rhizome Objectives
• Median age• Collection size• Steady-state snapshots• Annual iterations• Supply-Demand Equality
Multiple Objectives – Exercise (1)
Multiple Objectives – Exercise (2)
Multiple Objectives (1) - Answers
Multiple Objectives (2) – Answers
Fine-tuning Mjobjectives Mj
Smoothing the Mjdistribution Mj
Removing inactive Mjitems Mj
Linear programming Mj
Benchmarking Mjoutput limits Mj
Removing Mjinactive Mjitems Mj
Determine exact Mjweeding cutoff dates Mj
Calculate the active/ Mjinactive collections for Mj
each rhizome Mj
Use active collection size Mjin calculating objectives Mj
“Unto every one that hath shall be given, and he shall have abundance; but from him that hath not shall be taken away even that which he hath.”
— Matthew 25:29
Smoothing Mjthe Mj
distribution Mj
Adjust the relative distribution of Mjcirculation by using the square root Mjof each rhizome's circulation rather Mj
than the exact totals Mj
Benchmarking Mjoutput limits Mj
Establish upper and Mjlower limits for changes Mj
in each rhizome Mj
Volume of annual Mjpublication Mj
Annual additions by Mjbenchmark libraries Mj
Annual volume of Mjreviewed titles Mj
Linear Mjprogramming Mj
