Project sustainability is a recent concept predominantly debated and employed by international aid organisations working within the field of development aid. It is deemed to be a high-level examination whether the aid intervention has been successful or not. Even though all the international aid organisations examined in the thesis share the viewpoint that project sustainability has to do with the maintenance of the achieved outcomes after the aid intervention has come to an end, there are some shortages in their definitions of the term as well as the factors that can affect project...