A group of low-income countries (the HIPCs), most of which ave in Sub-
Saharan Africa, has continued to experience external debt problems. Be
cause the economic characteristics and the external imbalances of the
HIPCs are very different from those of middle-income countries, the ap
proach to analysing debt problems and debt reduction initiatives that
was developed during the debt crisis of the 1980s needs to be modified
and complemented in many important ways. This paper tries to fill thi
s gap by revisiting the methodological issues underlying the analysis
of debt sustainability, as well as the theory and empirical evidence o
f the effects of large debts on economic performance. It finds that (f
urther) debt reduction for the HIPCs may only have positive effects on
economic performance if it is seen as endorsing strong and effective
programmes of economic stabilisation and reform. This judgment will ha
ve to be made on a case-by-case basis. The paper concludes with a numb
er of principles which should guide any practical mechanisms for debt
relief.