Development Strategy of the Voodeship is a mandatory document programming the development of a region. One of its basic functions is to indicate actions allowing to promote and take advantage of the potential of environment and social and technical infrastructure with the aim to stimulate local development. Correct diagnosis and rational programming of actions are not possible without access to the information base identifying resources of environment and social and economic infrastructure. Mazovia Spatial Information System, with its open information catalogue, fills this niche. The role of Development Strategy is not restricted to identifying the potential of the voivodeship and accompanying social, cultural and economic conditions, but it also allows to monitor effects of its implementation. The system of spatial information incorporating modules for construction of scenarios and forecasts as well as of analysis of changes seems to be the right instrument to monitor the effects of the Development Strategy of the Voivodeship.