This document compares the open source library management software ABCD and Koha. It discusses installing versions of each, preparing a checklist to test functionality in selected modules, and consulting documentation. The selected modules for comparison are general features, cataloging, OPAC, and circulation. Key differences between the software's architectures and databases are described. Unique features of each in the selected modules are outlined. In conclusion, both are found to have excellent functionality, but ABCD runs on more platforms and has more independent modules and features while Koha has a larger community and support. A more detailed comparison targeting all module functionalities and user experiences is recommended.