This document provides an overview and introduction to a book titled "Case Studies in Knowledge Management". The book contains 20 case studies investigating knowledge management (KM) implementations in various organizational settings around the world. The case studies cover topics such as organizational learning, retaining organizational knowledge, KM strategy, KM in support of projects, knowledge transfer, and issues in KM. The document defines key concepts in KM such as organizational memory, learning, and knowledge management systems. It also discusses classifications of KM systems and related technologies. The goal of the book and this introduction is to move beyond KM theory and provide practical examples of how organizations have implemented KM to improve performance.