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The NASA Earth Science Data and Information System (ESDIS) Project collects, processes, and distributes a wide variety of environmental observations and data products. High-quality metadata and documentation is required in order for these data and products to contribute to reproducible scientific understanding. The Metadata Evolution for NASA Data Systems (MENDS) Project recently recommended that ESDIS adopt International (ISO) metadata standards and, at the same time, explore extensions to those standards that might be required for particular NASA data types and products. This effort has resulted in a what is known as "NASA Best Practices for ISO" and there have been many discussions, and assumptions, about what this constitutes since the beginning of the MENDS Project.