Abstract
Governance experience stressed the fact that Public administration bodies strongly need for a model specifically dedicated to evaluate the activity of development policies planning. In this paper a quite innovative methodology is proposed in order to construct an evaluation model, on which basis, the "planner" is able to assess the effects of strategic and sector development regional plans. Based on a set of economic indicators, that the model combines to define a Synthetic Priority Index (SPI), the administrators involved in the planning activity are able to make optimal choices on: a) the regional distributions of public investments; b) the economic and financial features and characteristics of public investments; c9 the Architecture of public investments. The definition of the SPI model, experimented on the Lombardy Region case emphasizes the relationships among the economic theory (quantifying the impact of investments), the territory (the working and intervention space), and the public finance (the optimal rule of spending the public resources).