The undergoing democratic transition in Mexico has produced substantial changes in the political system. In particular, Congress, since 1997, embarked in a continual consolidation process towards a more democratic and active institution. During more than 70 years, Mexico's political system was domain by the executive branch, with a hegemonic party controlling every elective and selective position, rendering congress as a mere appendix to the presidential power. Political plurality has reconfigured substantially Executive-Legislative relations, particularly in the policy making process. The...