This document summarizes an ex-ante evaluation of improved potato varieties for Sub-Saharan Africa conducted using the IMPACT agricultural sector simulation model. The evaluation found that introducing higher-yielding, disease-resistant potato varieties in 9 countries could have positive impacts including: increased potato production and consumption; reduced world market prices for potatoes and other crops; economic welfare gains of $10-70 million; and returns on investment of over 50% for the variety improvement program. However, impacts depend strongly on adoption levels of the new varieties by smallholder farmers.