What caused the debt-currency crisis in these country's?

Following the first major post-war developing-country debt/currency crisis (in the early 80's), the International Monetary Fund (IMF) promised to produce more detailed and comprehensive national income accounts for it's members. Then, in late 1994 there was another crisis in Mexico, another in Thailand (and east Asia generally), and still another in Argentina in 2001. Discuss the causes of each of these, and the IMF's approach to their respective solutions.