In Public-Private Partnerships (PPPs), private partners assume more responsibility for public projects than in traditional approaches. The larger responsibility of the private partner is expected to improve efficiencies of the project. However, it also increases potential challenges such as conflicts of interest. If the dynamic structures which cause challenges in PPPs are identified, they will help to predict potential challenges in future PPP projects. Therefore, this research develops a dynamics model of which challenges arise in the application of PPP approaches to space projects. The PPP dynamics model is illustrated by using system dynamics modeling. In the first step, this research develops a traditional-approach model. In the second step, it proposes the PPP model, which is a modification of the traditional-approach model. In the third step, this research tests the PPP model by applying it to four space-related PPP cases: the European navigation system Galileo, the Japanese navigation system QZSS, the Japanese launch vehicle GX, and the U.S. launch vehicle families EELV. The PPP model passes these four tests. In the PPP model, three variables play important roles: conflicts of interest among parties, user satisfaction, and the private partner's revenue risk. The three variables represent interests of stakeholders such as the public sector, private partners, and users. Conflicts of interest among parties increase cost schedule inefficiencies. More cost schedule inefficiencies lead to less user satisfaction. Less user satisfaction results in more revenue risk for the private partner. More revenue risk for the private partner leads to more conflicts of interest among parties.
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