Book excerpt: Despite its beneficial aspects, public debt can be hazardous for macroeconomic performance should it reach unrepayable levels as a consequence of snowballing explosive trends. Failure to monitor the existing trend in public debt in order to detect such divergences from the stable path, and the lack of an adaptive public financial management can potentially culminate in a public debt crisis whose disruptive economic impacts can permeate all sectors of the economy very swiftly. However, public debt sustainability is a vague concept with no straightforward operational definitions. In addition, its multi-faceted nature is an impediment for the implementation of real-world appraisal of the fiscal posture from a stability viewpoint. As such, quantifying the public debt sustainability is essential for overhauling the fiscal policies so as to avoid a potential debt crisis stemming from malfunctioning fiscal policies. This book provides the reader with a practical and straightforward framework that outlines a tool for undertaking public debt sustainability analysis. In order to guide further empirical investigations, the discussion in this book is underpinned by a real-world application of the model which highlights the practical aspects of the tool with reference to time-varying empirical evidence from a developing country.