This document discusses discovery systems used in academic libraries and provides projects and case studies using different discovery systems. It begins with an overview of what discovery systems are and key vendors like Primo, Summon, and EDS. It then describes projects using Summon that involved user experience studies and improvements. The case study on migrating to Summon 2 discusses the planning, analysis including surveys, design including prototypes, and implementation. Finally, it reviews implementing EDS and using its API, comparing features of Primo, Summon, and EDS.