In 1987 MID appeared in the provincial Missions elections in an alliance with the Justicialist Party. The formula Julio César Humada (PJ) - José Piro (MID) wins the election and two years later Schiavoni is appointed Undersecretary of Economics. Its management carried out deep economic reforms in tune with the government of Carlos Menem: the Bank of Missions, the Insurance Institute, and Missionary Paper were privatized; In some locations, the drinking water and sewer service was concessioned, and a hydroelectric dam was put into operation under a private concession.
The following elections (1991 and 1995) are also won by the PJ, with Ramón Puerta as candidate. Under his government, Schiavoni joins the peronism and was appointed Minister of Economy and Public Works between 1998 and 1999
Then he was the Cabinet Coordinating Minister of the new peronist Missions Governor, Carlos Rovira.