The economic success of any country can be brought by the efficient and effective public financial management system that can not be exposed to corruption and embezzlement. With this view most developing countries have been changed their financial management system in a way that can solve the problem of their citizens, by focusing in the priority sectors as response to inadequate and outdated public financial management system that can not adequately allocate a resources in priority sectors and manual system to Integrated Financial Management systems is mainly the recommendation of the international institutions and the donor governments. Countries such as Ethiopia, Estonia and Tanzania have done a reform in the financial management system especially Public Expenditure Management. In this book, I go through the countries financial management system and present by comparing and contrasting External Auditing and Corruption Management of the respective countries in relation to their success and failure pointing out good practices of the countries.