NPOs are increasingly working with external partners, such as companies or foundations, to secure their charitable activities, projects, and programs for the long term. Because: In view of the many challenges, we are currently facing as a society - be it the climate crisis, armed conflicts, the growing gap between rich and poor, the inequalities in our education system, etc. - it is becoming increasingly clear to us: we will not solve these challenges on our own. Cross-sectoral cooperation is needed to bundle knowledge and resources in the interest of the community and the common future. An elementary part of successful cooperation is the act of grant writing for the project in a well-thought-out concept at the beginning of the partnership, but also the ongoing written reporting in the sense of transparency, information transfer, and securing of a long-term relationship.