EN
The aim of this article is to describe selected methods for evaluating legitimacy of engagement of the public sector into the public-private partnership (PPP). It also presents an example of public-private partnership, showing the role of the private partner in creating the final version of investment planned by the public-sector authority. The author presents the origin and evolution of public-private partnership in Poland, analyzes the strengths/opportunities and threats connected with public and private sector partnership, as well as describes and evaluates the methods used for assessing the effectiveness of cooperation in the model of public-private partnership.