Funding for the TANDem project was awarded on 4th April 2019 at a ceremony of the King Baudouin Foundation in the presence of Her Royal Highness Princess Astrid, Princess of Belgium. After contract negotiations the project officially started in November 2019. In November 2020 the first annual report was published. This report documents the very hard work that has been done in year 1 to get the TANDem project going, encouraged by the dedication and hard work of all TANDem Consortium members, and by the ongoing support and enthusiasm for the project from the global TSC community.