Much have been said about metadata which is "data about data" used for classification and retrieval of information. However, metadata is not created by itself. This paper will present the design, interface and implementation of our own metadata tool called Metadata Management System, MMS that was developed to facilitate the creation, maintenance and storage of metadata. This metadata tool supports two well-known metadata models, Dublin Core and SCORM 1.2 (IEEE Learning Object Metadata). The author will also elaborate on the implementation of metadata in the Malaysia Grid for Learning, (MyGfL) portal. These would include the usage of MMS by MyGfL potential content providers, problems encountered and their feedback about the MMS.