Governments have become increasingly concerned about their financial situation, as it is a corollary of sovereignty. They are also aware that any financial or economic disruption will directly affect social peace. It is therefore vital for a state to think about the sustainability of its finances, bearing in mind that sustainability is not a one-size-fits-all concept, but evolves according to choices, capacity and resilience. This book is an attempt to identify the parameters for configuring genuine sustainability of public finances. A firm, "new" answer to these historic questions for Tunisian public finances was not possible, especially given the multiple endogenous and exogenous constraints that remain evolving and sometimes unpredictable.