GreenGlass is an interactive, web-based application designed to assist libraries in making evidence-based decisions about their print collections. By integrating local circulation data with external resources like WorldCat holdings and HathiTrust Digital Library, GreenGlass provides comprehensive insights that enable libraries to responsibly manage low-use print monographs and serials. This tool facilitates informed choices on deselection, retention, digitization, and transfer of materials, helping libraries optimize physical space while preserving the scholarly record. Key Features and Functionality: - Comprehensive Collection Analysis: GreenGlass allows libraries to explore and visualize their collections in the context of data from numerous other libraries, offering a broader perspective on holdings and usage. - Data Integration: Combines local item and circulation data with external databases such as WorldCat and HathiTrust, providing a holistic view of collection overlap and uniqueness. - Query Builder: A multi-faceted tool that enables the development of preservation and withdrawal scenarios, allowing for real-time modeling and decision-making. - Collection Segmentation: Facilitates the identification of multi-edition titles, duplicates, multi-volume sets, subjects, and call numbers, aiding in precise collection management. - Shared Print Management: Supports collaborative efforts by generating custom reports and lists for shared print activities, helping libraries share the responsibility and costs of maintaining print collections. Primary Value and Problem Solved: GreenGlass addresses the challenge libraries face in managing extensive print collections amidst evolving space and resource constraints. By providing actionable insights and comprehensive data analysis, it empowers libraries to make informed decisions about which materials to retain, deselect, digitize, or transfer. This strategic approach not only reclaims valuable physical space but also ensures the preservation of essential scholarly resources, aligning collection management practices with institutional priorities and user needs.