Metadata schema is very important and should be considered in digital library. Metadata schema makes metadata interoperability in digital libraries. Standard metadata schema is needed for consistency and ensuring interoperability. We should also consider the requirements of partner library institutions for creating and developing the standard metadata schema. Without consider the requirements of those institutions, metadata interoperability is not going well. This book gives a description about the issues of standardization metadata schema and recommendations for securing interoperability among digital libraries, especially for FORDA digital libraries-Indonesia as a case study place. This book divided in five chapter. The first chapter is the introduction section. Second shapter gives the description about literature reviews. Third chapter presents the research methodology. The fourth chapter is the finding research description. The finding shows that there are several issues which create interoperability problems in the current FORDA metadata schema. Lastly, the fifth chapter presents the discussion and conclusion.