To instruction providers or publishers, metadata is interesting because it eases the discovery and access to their resources to use and reuse it. Several organizations are attempting to define and mainstream metadata standards. There is a lack of tools to edit and ease the exchange of metadata among different standards. The whole bandwidth of educational activities would benefit from the existence and development of a user-friendly, multilingual and consistent metadata tool. Because of the diversity of ongoing standardization initiatives, this tool should be based on a consistent metadata-mapping model. This paper presents the development of a new Web based mapping tool, which could be the key to achieve the interoperability goal and to ease the description and search of instructional resources for a wide range of users.