GTD has been referenced in NASA’s Software Engineering and Assurance Handbook. NASA-HDBK-2203 provides users and practitioners with guidance material for implementing NASA Software Engineering Requirements, and the implementation of the NASA Software Assurance and Software Safety requirements. The NASA Software Engineering and Assurance Handbook, NASA-HDBK-2203 is for the community that is involved in the acquisition, management, development, assurance, maintenance, and operations of NASA software. On-board space software is primarily developed at our German subsidiary in Markdorf (Baden-Württemberg). Having our method routinely used in ESA space missions and now also adopted by NASA is an honor and a source of pride for us.