This publication is written as a consensus document for professionals who manage a large number of trees that are considered primarily as individuals rather than as groups or stands. It is relevant for trees within public jurisdictions--such as municipalities, villages, towns, water districts, or counties--as well as other collections of managed private trees, such as those found on university campuses, cemeteries, military bases, utility corridors, corporate or institutional grounds, arboreta, homeowners associations, and private grounds. The primary purpose of this publication is to describe best practices for developing and utilizing tree inventories. It also strives to serve as a guide for making informed choices that will match inventory goals with needs and resources.