The mission that is pursued by this OECD TA 3.0 High-level architecture is to realise the Digital Transformation of Tax Administration. This complies with the vision that is laid out in document: OECD (2020), Tax Administration 3.0: The Digital Transformation of Tax Administration, OECD, Paris. http://www.oecd.org/tax/forum-on-tax-administration/publications-and-products/tax-administration-3-0-the-digital-transformation-of-tax-administration.htm