This document discusses setting objectives for library collections. It provides examples of using actuarial science concepts like average life expectancy, population size, and items added per time period to determine a stable collection size and items circulated. The document presents examples of calculating the collection size, average weeding age, and annual items added. It also discusses using average days in loan periods and turnaround times to estimate items out and items to be shelved. Finally, it presents exercises for setting multiple objectives for a collection.