The British Library for Development Studies migrated from an old proprietary library management system to the open source Koha system. They chose Koha because it was developed and maintained by a worldwide community, allowed them to install and modify it themselves, and aligned with their objectives of building capacity in developing countries. After evaluating various open source options based on licensing, community support, and functionality, Koha was seen as the most complete system. The migration was outsourced to a third party vendor and took approximately 8 months. While some issues remained, the implementation was considered a success with praise from users.