This article outlines a regional-scale assessment methodology using geographic
information systems (GIS) as a source of value-added information to identify and
prioritize areas within Africa where an irrigation and market-based poverty
alleviation model could potentially be applied to benefit poor, small-scale
farmers. This assessment methodology, Poverty Reduction through Irrigation and
Smallholder Markets (PRISM), is being piloted by a US-based private voluntary
organization to assist development organizations to better target and identify
smallholder communities for pro-poor market-led interventions that will
ultimately boost farm income and move large numbers of the rural poor out of
poverty. The Sahel region of West Africa is presented as a case study for the
piloting of a GIS scoping methodology.