Non-governmental non-profit organizations (NGOs) are involved in various project partnership during realization of their mission. Submitted paper identifies financial flows generated by the project partnerships of the selected NGO. What can be done to ensure sucess of such partnerships in general? An answer to this question and also pros and cons of project partnerships have been outlined. Furthermore concepts of transparency and sustainability have not been omitted in this regard. The area of the project partnership of NGOs is rather unusual to be covered by theory. That is why cross-sectional literature, which focuses primarily on partnerships of the public sector representatives, served us as a starting point. Subsequent confrontation of theory with particular case organization points to validity of some of the elements for the non-governmental non-profit sector. Additional fragments of knowledge have been appended to the existing one, thanks to this paper.