ISSSTE is the social security administration for public sector employees in Mexico. It is estimated that nearly 10% of the population has ISSSTE coverage for health care and other benefits. The Fox administration has been planning a pension reform for the ISSSTE system, and the proposal is now in committee in the Senate. Some unions are fiercely protesting the reform, while others are going along and seeking concessions at the margin.
You can read my paper about this reform and others. It has been translated into Spanish and will be published shortly in Foro Internacional in Mexico.