The article represents a construction of a quarterly econometric model of the Slovenian economy and an analysis of fundamental relationships of the Slovenian economy. For this purpose we formed a system of identities, consistent with the national accounts, and of stochastic equations, consistent with economic theory as well as institutional and constitutional characteristics of the Slovenian economy. The present econometric model of the Slovenian economy SIQM 2.1 consists of 97 equations and covers the period of 1997:1 – 2003:4. Adequacy of the model, i.e. its ability to reproduce the actual economic developments in the period under investigation, was verified by performing dynamic simulations. It was established that the results are econometrically satisfactory and in part even quite favourable.